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我的置顶 (8篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/06/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8%E5%BF%AB%E6%8D%B7%E9%94%AE" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>个人常用快捷键</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/05/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Git%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>个人常用 Git 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/01/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Docker%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-yellow mr-[6px]" style="font-weight: 550; display: inline-block;">3</div>个人常用 Docker 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/02/16/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8SQL%E5%87%BD%E6%95%B0" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">4</div>个人常用 SQL 函数</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/31/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Linux%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">5</div>个人常用 Linux 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/30/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Hutool%E5%B7%A5%E5%85%B7%E7%B1%BB" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">6</div>个人常用 Hutool 工具类</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/29/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Stream%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">7</div>个人常用 Stream 使用技巧</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/28/%E4%B8%AA%E4%BA%BASQL%E4%BC%98%E5%8C%96%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">8</div>个人 SQL 优化技巧</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/rabbit.svg" title="兔年" alt="生肖">
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display: inline-block;">5</div>Docker 安装 Consul 详细步骤</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/26/Docker%E5%AE%89%E8%A3%85OpenLDAP" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">6</div>Docker 安装 OpenLDAP 详细步骤</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/06/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8%E5%BF%AB%E6%8D%B7%E9%94%AE" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">7</div>个人常用快捷键</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/05/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Git%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">8</div>个人常用 Git 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/10/01/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Docker%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">9</div>个人常用 Docker 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/08/29/%E5%86%85%E7%BD%91CentOS%E6%9C%8D%E5%8A%A1%E5%99%A8%E8%AE%BE%E7%BD%AE%E7%BD%91%E7%BB%9C%E4%BB%A3%E7%90%86" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">10</div>内网CentOS服务器设置网络代理</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/28/%E4%B8%BA%E6%8C%87%E5%AE%9AGit%E4%BB%93%E5%BA%93%E5%8D%95%E7%8B%AC%E9%85%8D%E7%BD%AE%E7%94%A8%E6%88%B7%E5%90%8D%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">11</div>为指定Git仓库单独配置用户名和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/27/%E4%BF%AE%E6%94%B9Git%E6%89%80%E6%9C%89%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95%E4%B8%AD%E7%9A%84%E4%BD%9C%E8%80%85%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">12</div>修改Git所有提交记录中的作者和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/26/%E4%BF%AE%E6%94%B9Git%E6%9C%80%E5%90%8E%E4%B8%80%E6%AC%A1%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95%E7%9A%84%E4%BD%9C%E8%80%85%E5%92%8C%E9%82%AE%E7%AE%B1" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">13</div>修改Git最后一次提交记录的作者和邮箱</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/03/25/%E5%90%88%E5%B9%B6%E4%B8%A4%E4%B8%AAGit%E4%BB%93%E5%BA%93%E7%9A%84%E5%8E%86%E5%8F%B2%E6%8F%90%E4%BA%A4%E8%AE%B0%E5%BD%95" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">14</div>合并两个Git仓库的历史提交记录</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2022/02/16/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8SQL%E5%87%BD%E6%95%B0" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">15</div>个人常用 SQL 函数</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible collapsed" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/ox.svg" title="牛年" alt="生肖">
2021年 (2篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2021/05/29/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F%E4%B9%8B%E5%8D%95%E4%BE%8B%E6%A8%A1%E5%BC%8F" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>设计模式之单例模式</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2021/03/12/%E7%B2%BE%E5%AF%86%E8%AE%A1%E7%AE%97%E5%B7%A5%E5%85%B7%E7%B1%BB-BigDecimal" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>精密计算工具类-BigDecimal</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-802ad7d8><section class="VPSidebarItem level-0 collapsible has-active" data-v-802ad7d8 data-v-95d837d1><div class="item" role="button" tabindex="0" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><h2 class="text" data-v-95d837d1><img class="chinese-zodiac" style="position: static; vertical-align: middle; padding-bottom: 3px;" src="/img/svg/chinese-zodiac/pig.svg" title="猪年" alt="生肖">
2019年 (4篇)</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-95d837d1><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-95d837d1><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-95d837d1><!--[--><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/31/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Linux%E5%91%BD%E4%BB%A4" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-red mr-[6px]" style="font-weight: 550; display: inline-block;">1</div>个人常用 Linux 命令</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/30/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Hutool%E5%B7%A5%E5%85%B7%E7%B1%BB" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-orange mr-[6px]" style="font-weight: 550; display: inline-block;">2</div>个人常用 Hutool 工具类</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/29/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Stream%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-yellow mr-[6px]" style="font-weight: 550; display: inline-block;">3</div>个人常用 Stream 使用技巧</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-95d837d1 data-v-95d837d1><div class="item" data-v-95d837d1><div class="indicator" data-v-95d837d1></div><a class="VPLink link link" href="/categories/fragments/2019/12/28/%E4%B8%AA%E4%BA%BASQL%E4%BC%98%E5%8C%96%E6%8A%80%E5%B7%A7" data-v-95d837d1><!--[--><p class="text" data-v-95d837d1><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">4</div>个人 SQL 优化技巧</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-03322d68 data-v-2c336b25><div class="VPDoc has-sidebar has-aside" data-v-2c336b25 data-v-53ed897c><!--[--><!--]--><div class="container" data-v-53ed897c><div class="aside" data-v-53ed897c><div class="aside-curtain" data-v-53ed897c></div><div class="aside-container" data-v-53ed897c><div class="aside-content" data-v-53ed897c><div class="VPDocAside" data-v-53ed897c data-v-3d450548><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-3d450548 data-v-70b38f01><div class="content" data-v-70b38f01><div class="outline-marker" data-v-70b38f01></div><div class="outline-title" role="heading" aria-level="2" data-v-70b38f01>目录</div><nav aria-labelledby="doc-outline-aria-label" data-v-70b38f01><span class="visually-hidden" id="doc-outline-aria-label" data-v-70b38f01> Table of Contents for current page </span><ul class="root" data-v-70b38f01 data-v-e10534d6><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-3d450548></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-53ed897c><div class="content-container" data-v-53ed897c><!--[--><!--]--><!----><main class="main" data-v-53ed897c><div style="position:relative;" class="vp-doc _categories_fragments_2019_12_30_%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Hutool%E5%B7%A5%E5%85%B7%E7%B1%BB" data-v-53ed897c><div><h1 id="个人常用-hutool工-具类" tabindex="-1">个人常用 Hutool工 具类 <span class="VPBadge warning" data-v-b2451d00><!--[-->持续更新<!--]--></span> <a class="header-anchor" href="#个人常用-hutool工-具类" aria-label="Permalink to &quot;个人常用 Hutool工 具类 &lt;Badge text=&quot;持续更新&quot; type=&quot;warning&quot; /&gt;&quot;">​</a></h1><!----><p><strong>C：</strong> 技术圈常说一句：“你要会写轮子，也要会用轮子”。工作的时候，为了提升开发效率，节约开发时间，也常常提醒自己不要重复造 “轮子”。</p><p>每次开启一个新项目，除了搭建项目必备环境之外，必然要整理一下之前项目沉淀下来的工具类，然后 C V 大法。习惯了一些工具类后，新项目中用不了或是换一下总是感觉缺点什么，再加上每个人都有自己遇到或沉淀的工具类，项目中遇到工具类重复也是很常见的事儿。</p><p>话说回来，这些工具类就是开发中必不可少的一种 “轮子”。对于大多数同学，受限于技术，轮子可能勉强写的出来，但是写的是不是够好，够完善，这质量就没法保证了。</p><p>谁都是从一开始过来的，但好在有这么一些有志之士，将经年累月写过的轮子反复整理，反复打磨，推出了一个项目，它就是 Hutool。</p><p>接下来，笔者就带大家学习一些个人常用的 Hutool 工具类。</p><h2 id="判断相等" tabindex="-1">判断相等 <a class="header-anchor" href="#判断相等" aria-label="Permalink to &quot;判断相等&quot;">​</a></h2><h3 id="传统用法" tabindex="-1">传统用法 <a class="header-anchor" href="#传统用法" aria-label="Permalink to &quot;传统用法&quot;">​</a></h3><p>判断两个内容相等很常见了吧？</p><p>Java 7 的时候，官方还在 java.util 包下给提供了一个 Objects 工具类，源代码如下：</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * Returns {@code true} if the arguments are equal to each other</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * and {@code false} otherwise.</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * Consequently, if both arguments are {@code null}, {@code true}</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * is returned and if exactly one argument is {@code null}, {@code</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * false} is returned. Otherwise, equality is determined by using</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * the {@link Object#equals equals} method of the first</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * argument.</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> a</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> an object</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> b</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> an object to be compared with {@code a} for equality</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> {@code true} if the arguments are equal to each other</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * and {@code false} otherwise</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@see</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Object#equals(Object)</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Object a, Object b) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> b) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">||</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">!=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &amp;&amp;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> a.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(b));</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>这的确可以解决 80% 的判断相等问题了，也可以有效避免 NPE 问题。但是笔者比较贪心，所以一直使用的 Hutool 提供的 ObjectUtil 工具类来判断相等。</p><h3 id="objectutil" tabindex="-1">ObjectUtil <a class="header-anchor" href="#objectutil" aria-label="Permalink to &quot;ObjectUtil&quot;">​</a></h3><p>在 Java 中，判断不同内容是否相等有多种情况，这在《阿里巴巴Java开发手册》中也有强调，笔者用 ObjectUtil 分别示范下不同情况的使用方法。</p><div class="warning custom-block"><p class="custom-block-title">《阿里巴巴Java开发手册》</p><p>【强制】所有整型包装类对象之间值的比较，全部使用 equals 方法比较。 说明：对于 Integer var = ? 在-128 至 127 之间的赋值，Integer 对象是在 IntegerCache.cache 产生， 会复用已有对象，这个区间内的 Integer 值可以直接使用==进行判断，但是这个区间之外的所有数据，都 会在堆上产生，并不会复用已有对象，这是一个大坑，推荐使用 equals 方法进行判断。</p></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// false</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// false</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">notEqual</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1L</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// false</span></span></code></pre></div><p><strong>ObjectUtil 的 equal() 源代码，如下：</strong></p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较两个对象是否相等。&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 相同的条件有两个，满足其一即可：&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;ol&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;obj1 == null &amp;&amp; obj2 == null&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;obj1.equals(obj2)&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;如果是BigDecimal比较，0 == obj1.compareTo(obj2)&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;/ol&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否相等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@see</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Objects#equals(Object, Object)</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Object obj1, Object obj2) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 判断是否为 BigDecimal 类型，如果是用 compareTo 比较</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (obj1 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">instanceof</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BigDecimal </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&amp;&amp;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> obj2 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">instanceof</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> BigDecimal) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> NumberUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">((BigDecimal) obj1, (BigDecimal) obj2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 否则使用 Java 官方提供的 Objects 工具类比较</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Objects.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(obj1, obj2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较两个对象是否不相等。&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否不等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@since</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 3.0.7</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> notEqual</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Object obj1, Object obj2) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> false</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ==</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(obj1, obj2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>要是觉得 equal 这个单词不喜欢，你还可以用它的别名方法：（作者们考虑的是有点周到了）</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较两个对象是否相等，此方法是 {</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@link</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> #</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">equal(Object, Object)</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">}的别名方法。&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 相同的条件有两个，满足其一即可：&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;ol&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;obj1 == null &amp;&amp; obj2 == null&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;obj1.equals(obj2)&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;li&gt;如果是BigDecimal比较，0 == obj1.compareTo(obj2)&lt;/li&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * &lt;/ol&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> obj2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 对象2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否相等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@see</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> #equal(Object, Object)</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@since</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 5.4.3</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(Object obj1, Object obj2) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(obj1, obj2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="warning custom-block"><p class="custom-block-title">《阿里巴巴Java开发手册》</p><p>【强制】BigDecimal 的等值比较应使用 compareTo()方法，而不是 equals()方法。 说明：equals()方法会比较值和精度（1.0 与 1.00 返回结果为 false），而 compareTo() 则会忽略精度。</p><p>说明：equals()方法会比较值和精度（1.0 与 1.00 返回结果为 false），而 compareTo()则会忽略精度。</p></div><p>诚然，从上方源代码中我们可以清楚地看到 ObjectUtil 比较的时候还区分了 BigDecimal 类型，这也轻松的解决了此强制问题。</p><p><strong>在 ObjectUtil 比较 BigDecimal 类型相等时用到的 NumberUtil 中的 equals() 源代码，如下：</strong></p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较大小，值相等 返回true&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法通过调用{</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@link</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> BigDecimal</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">#</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">compareTo(BigDecimal)</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">}方法来判断是否相等&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法判断值相等时忽略精度的，即0.00 == 0</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> bigNum1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> bigNum2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否相等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(BigDecimal bigNum1, BigDecimal bigNum2) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (bigNum1 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> bigNum2) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 如果用户传入同一对象，省略compareTo以提高性能。</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> true</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (bigNum1 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ||</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> bigNum2 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> false</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> ==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> bigNum1.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">compareTo</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(bigNum2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h3 id="numberutil" tabindex="-1">NumberUtil <a class="header-anchor" href="#numberutil" aria-label="Permalink to &quot;NumberUtil&quot;">​</a></h3><div class="warning custom-block"><p class="custom-block-title">《阿里巴巴Java开发手册》</p><p>【强制】浮点数之间的等值判断，基本数据类型不能用==来比较，包装数据类型不能用 equals 来判断。</p><p>说明：浮点数采用“尾数+阶码”的编码方式，类似于科学计数法的“有效数字+指数”的表示方式。二进 制无法精确表示大部分的十进制小数。</p><p>解决方法：</p><ol><li>指定一个误差范围，两个浮点数的差值在此范围之内，则认为是相等的。</li><li>使用 BigDecimal 来定义值，再进行浮点数的运算操作。</li></ol></div><p>浮点数比较的时候依然可以使用 ObjectUtil，但是也可以直接采用 NumberUtil：</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(NumberUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0.1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0.1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">)); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(ObjectUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">equal</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(BigDecimal.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">valueOf</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0.1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">), BigDecimal.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">valueOf</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0.1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">))); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span></code></pre></div><p><strong>上方用到的 NumberUtil 的 equals() 源代码，如下：</strong></p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较大小，值相等 返回true&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法通过调用{</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@link</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Double</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">#</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">doubleToLongBits(double)</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">}方法来判断是否相等&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法判断值相等时忽略精度的，即0.00 == 0</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> num1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> num2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否相等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@since</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 5.4.2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num1, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num2) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Double.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doubleToLongBits</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(num1) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Double.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">doubleToLongBits</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(num2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 比较大小，值相等 返回true&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法通过调用{</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@link</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> Float</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">#</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">floatToIntBits(float)</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">}方法来判断是否相等&lt;br&gt;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 此方法判断值相等时忽略精度的，即0.00 == 0</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> num1</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> num2</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 数字2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 是否相等</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@since</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 5.4.5</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> equals</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">float</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num1, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">float</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num2) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Float.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">floatToIntBits</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(num1) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> Float.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">floatToIntBits</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(num2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h2 id="程序计时" tabindex="-1">程序计时 <a class="header-anchor" href="#程序计时" aria-label="Permalink to &quot;程序计时&quot;">​</a></h2><h3 id="传统用法-1" tabindex="-1">传统用法 <a class="header-anchor" href="#传统用法-1" aria-label="Permalink to &quot;传统用法&quot;">​</a></h3><p>为了计算程序执行耗时，通常的做法是在程序段前后分别记录一个时间毫秒值变量，然后用结束时间毫秒值减去开始时间毫秒值就可以了。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> startTime</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> System.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">currentTimeMillis</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 要计时的程序片段</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">long</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> endTime</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> System.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">currentTimeMillis</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;总耗时：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (endTime </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">-</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> startTime) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;ms&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span></code></pre></div><h3 id="timeinterval" tabindex="-1">TimeInterval <a class="header-anchor" href="#timeinterval" aria-label="Permalink to &quot;TimeInterval&quot;">​</a></h3><p>实际上传统方法也没什么问题，但是当我们需要持续计时的时候，它就不是那么美丽了。Hutool 提供了 <code>TimeInterval</code> 来帮助我们实现灵活计时的需求。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">TimeInterval</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> timer</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> DateUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">timer</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 要计时的程序片段1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;总耗时：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> timer.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">interval</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;ms&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 要计时的程序片段2</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;总耗时：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> timer.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">interval</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;ms&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span></code></pre></div><h2 id="uuid生成器" tabindex="-1">UUID生成器 <a class="header-anchor" href="#uuid生成器" aria-label="Permalink to &quot;UUID生成器&quot;">​</a></h2><h3 id="传统用法-2" tabindex="-1">传统用法 <a class="header-anchor" href="#传统用法-2" aria-label="Permalink to &quot;传统用法&quot;">​</a></h3><p>利用 JDK 内置的 <code>java.util.UUID</code>，可以生成 32 位的 UUID，但一般我们使用的时候还要再对其“加工”一下，转换成字符串并去除连字符。</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">UUID</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> uuid</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> UUID.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">randomUUID</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 转换为字符串</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> uuidStr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> uuid.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">toString</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(uuidStr); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 7f4c0b42-d066-4baa-bc24-4d74a69ea78e</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 去除连字符</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> replaceUuidStr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> uuidStr.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">replace</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;-&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(replaceUuidStr); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 7f4c0b42d0664baabc244d74a69ea78e</span></span></code></pre></div><h3 id="idutil" tabindex="-1">IdUtil <a class="header-anchor" href="#idutil" aria-label="Permalink to &quot;IdUtil&quot;">​</a></h3><div class="tip custom-block"><p class="custom-block-title">Hutool文档</p><p>Hutool重写了java.util.UUID的逻辑，对应类为cn.hutool.core.lang.UUID，使生成不带-的UUID字符串不再需要做字符替换，性能提升一倍左右。</p></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> uuidStr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> IdUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">fastUUID</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(uuidStr); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// f69c5c5c-73fd-4286-b338-133927789d71</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> simpleUuidStr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> IdUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">fastSimpleUUID</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">();</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(simpleUuidStr); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 6905bc8239c1489a9f6fb18cee1d6884</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span></code></pre></div><h2 id="获取spring" tabindex="-1">获取Spring <a class="header-anchor" href="#获取spring" aria-label="Permalink to &quot;获取Spring&quot;">​</a></h2><h3 id="springutil" tabindex="-1">SpringUtil <a class="header-anchor" href="#springutil" aria-label="Permalink to &quot;SpringUtil&quot;">​</a></h3><div class="tip custom-block"><p class="custom-block-title">Hutool文档</p><p>使用Spring Boot时，通过依赖注入获取bean是非常方便的，但是在工具化的应用场景下，想要动态获取bean就变得非常困难，于是Hutool封装了Spring中Bean获取的工具类——SpringUtil。</p></div><p>要使用 SpringUtil，首先要完成两个操作。</p><ol><li>使用 <code>ComponentScan</code> 额外指定组件扫描包（记得别忘了也把自己的扫描包也加上）</li><li>使用 <code>@Import</code> 导入 SpringUtil 类</li></ol><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">SpringBootApplication</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Import</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(cn.hutool.extra.spring.SpringUtil.class)</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">@</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">ComponentScan</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">basePackages</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;com.xxx&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;cn.hutool.extra.spring&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">})</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#F69D50;"> WebApiApplication</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> void</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> main</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[] </span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;">args</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SpringApplication.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">run</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(args);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><p>常见用法：</p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 获取 Spring 容器中的指定对象</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">UserMapper</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> userMapper</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SpringUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getBean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(UserMapper.class);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 获取配置文件中的指定属性值</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> activeProfile</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> SpringUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">getProperty</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;spring.profiles.active&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span></code></pre></div><h2 id="集合操作" tabindex="-1">集合操作 <a class="header-anchor" href="#集合操作" aria-label="Permalink to &quot;集合操作&quot;">​</a></h2><p>集合的出现极大的解决了复杂数据处理的需要，但仅凭 JDK 内置的集合方法，还是略显“苦涩”。</p><h3 id="maputil" tabindex="-1">MapUtil <a class="header-anchor" href="#maputil" aria-label="Permalink to &quot;MapUtil&quot;">​</a></h3><p>顾名思义，MapUtil 生来是为了更方便的操作 Map 集合的。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>单是能快速帮你创建指定初始容量大小的 Map 集合这一点就爱了。</p></div><div class="warning custom-block"><p class="custom-block-title">《阿里巴巴Java开发手册》</p><p>【推荐】 集合初始化时， 指定集合初始值大小。</p><p>说明： HashMap 使用 HashMap(int initialCapacity) 初始化，如果暂时无法确定集合大小， 那么指定默认值（ 16） 即可。</p><p>正例： initialCapacity = (需要存储的元素个数 / 负载因子) + 1。 注意负载因子（即 loader factor） 默认为 0.75，如果暂时无法确定初始值大小，请设置为 16（即默认值） 。</p><p>反例： HashMap 需要放置 1024 个元素，由于没有设置容量初始大小，随着元素增加而被迫不断扩容， resize()方法总共会调用 8 次，反复重建哈希表和数据迁移。当放置的集合元素个数达千万级时会影响程序 性能。</p></div><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 判断是否为空、不为空</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Map</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Map</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map2</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> HashMap&lt;&gt;();</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">isEmpty</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(map1); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag2</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">isNotEmpty</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(map1); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// false</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag3</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">isEmpty</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(map2); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// true</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag4</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">isNotEmpty</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(map2); </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// false</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(flag1);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(flag2);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(flag3);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">println</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(flag4);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 快速创建单键值对的 HashMap</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">HashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map3</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">of</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;CN&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;中国&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 快速创建单键值对的 LinkedHashMap</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">HashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map4</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">of</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;CN&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;中国&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 快速创建指定初始容量大小的 HashMap</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">HashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map5</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 快速创建LinkedHashMap</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">HashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map6</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 快速创建指定初始容量大小的 LinkedHashMap</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">HashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">Object</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">&gt; </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">map7</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> MapUtil.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// ...</span></span></code></pre></div><p><strong>MapUtil 的 newHashMap() 源代码，如下：</strong></p><div class="language-java vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">java</span><pre class="shiki shiki-themes github-light github-dark-dimmed vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 新建一个HashMap</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> &lt;K&gt;</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Key类型</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> &lt;V&gt;</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Value类型</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> size</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 初始大小，由于默认负载因子0.75，传入的size会实际初始大小为size / 0.75 + 1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> HashMap对象</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">K, V</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> HashMap</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">K, V</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&gt;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> size) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(size, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">false</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">/**</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * 新建一个HashMap</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> *</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> &lt;K&gt;</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Key类型</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> &lt;V&gt;</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Value类型</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> size</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 初始大小，由于默认负载因子0.75，传入的size会实际初始大小为size / 0.75 + 1</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@param</span><span style="--shiki-light:#E36209;--shiki-dark:#F69D50;"> isOrder</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> Map的Key是否有序，有序返回 {@link LinkedHashMap}，否则返回 {@link HashMap}</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@return</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> HashMap对象</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> * </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">@since</span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> 3.0.4</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> */</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">public</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> static</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> &lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">K, V</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> HashMap</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">K, V</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&gt;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> newHashMap</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> size, </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> isOrder) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> initialCapacity</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) (size </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">/</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> DEFAULT_LOAD_FACTOR) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> isOrder </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">?</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> LinkedHashMap&lt;&gt;(initialCapacity) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">:</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> HashMap&lt;&gt;(initialCapacity);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-53ed897c data-v-f3af8004><!--[--><!--[--><!--[--><!--[--><!----><!--]--><!--]--><!--]--><!--]--><div class="edit-info" data-v-f3af8004><div class="edit-link" data-v-f3af8004><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/Charles7c/charles7c.github.io/edit/main/docs/categories/fragments/2019/12/30/个人常用Hutool工具类.md" target="_blank" rel="noreferrer" data-v-f3af8004><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-f3af8004><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> 不妥之处，敬请雅正<!--]--></a></div><div class="last-updated" data-v-f3af8004><p class="VPLastUpdated" data-v-f3af8004 data-v-a25eb6f3>最后更新: <time datetime="2022-11-04T07:01:48.000Z" data-v-a25eb6f3></time></p></div></div><nav class="prev-next" data-v-f3af8004><div class="pager" data-v-f3af8004><a class="VPLink link pager-link prev" href="/categories/fragments/2019/12/31/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Linux%E5%91%BD%E4%BB%A4" data-v-f3af8004><!--[--><span class="desc" data-v-f3af8004>上一篇</span><span class="title" data-v-f3af8004><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">5</div>个人常用 Linux 命令</span><!--]--></a></div><div class="pager" data-v-f3af8004><a class="VPLink link pager-link next" href="/categories/fragments/2019/12/29/%E4%B8%AA%E4%BA%BA%E5%B8%B8%E7%94%A8Stream%E4%BD%BF%E7%94%A8%E6%8A%80%E5%B7%A7" data-v-f3af8004><!--[--><span class="desc" data-v-f3af8004>下一篇</span><span class="title" data-v-f3af8004><div class="text-color-gray mr-[6px]" style="font-weight: 550; display: inline-block;">7</div>个人常用 Stream 使用技巧</span><!--]--></a></div></nav></footer><!--[--><!--[--><!--[--><div id="comment-container"></div><!--]--><!--]--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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display: inline-block;\\\">1</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/rabbit.svg\\\" title=\\\"兔年\\\" alt=\\\"生肖\\\">\\n 2023年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一文详解限流接口实现\",\"link\":\"/categories/fragments/2023/12/21/一文详解限流接口实现\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>阿里巴巴的Code Review方法论与实践总结\",\"link\":\"/categories/fragments/2023/01/06/CodeReview方法论与实践总结\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (15篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>简单聊聊如何让网站开启灰色显示\",\"link\":\"/categories/fragments/2022/12/07/网站开启灰色显示\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>使用 IntelliJ IDEA 进行远程程序调试\",\"link\":\"/categories/fragments/2022/11/01/使用IDEA进行远程程序调试\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>CentOS 安装 Docker、Docker Compose\",\"link\":\"/categories/fragments/2022/10/31/CentOS安装Docker\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Docker 安装 MinIO 详细步骤\",\"link\":\"/categories/fragments/2022/10/28/Docker安装MinIO\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>Docker 安装 Consul 详细步骤\",\"link\":\"/categories/fragments/2022/10/27/Docker安装Consul\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>Docker 安装 OpenLDAP 详细步骤\",\"link\":\"/categories/fragments/2022/10/26/Docker安装OpenLDAP\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>个人常用快捷键\",\"link\":\"/categories/fragments/2022/10/06/个人常用快捷键\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>个人常用 Git 命令\",\"link\":\"/categories/fragments/2022/10/05/个人常用Git命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>个人常用 Docker 命令\",\"link\":\"/categories/fragments/2022/10/01/个人常用Docker命令\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>内网CentOS服务器设置网络代理\",\"link\":\"/categories/fragments/2022/08/29/内网CentOS服务器设置网络代理\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>为指定Git仓库单独配置用户名和邮箱\",\"link\":\"/categories/fragments/2022/03/28/为指定Git仓库单独配置用户名和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>修改Git所有提交记录中的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/27/修改Git所有提交记录中的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>修改Git最后一次提交记录的作者和邮箱\",\"link\":\"/categories/fragments/2022/03/26/修改Git最后一次提交记录的作者和邮箱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>合并两个Git仓库的历史提交记录\",\"link\":\"/categories/fragments/2022/03/25/合并两个Git仓库的历史提交记录\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">15</div>个人常用 SQL 函数\",\"link\":\"/categories/fragments/2022/02/16/个人常用SQL函数\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>设计模式之单例模式\",\"link\":\"/categories/fragments/2021/05/29/设计模式之单例模式\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>精密计算工具类-BigDecimal\",\"link\":\"/categories/fragments/2021/03/12/精密计算工具类-BigDecimal\"}],\"collapsed\":true},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/pig.svg\\\" title=\\\"猪年\\\" alt=\\\"生肖\\\">\\n 2019年 (4篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>个人常用 Linux 命令\",\"link\":\"/categories/fragments/2019/12/31/个人常用Linux命令\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>个人常用 Hutool 工具类\",\"link\":\"/categories/fragments/2019/12/30/个人常用Hutool工具类\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>个人常用 Stream 使用技巧\",\"link\":\"/categories/fragments/2019/12/29/个人常用Stream使用技巧\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>个人 SQL 优化技巧\",\"link\":\"/categories/fragments/2019/12/28/个人SQL优化技巧\"}],\"collapsed\":true}],\"/categories/solutions/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/tiger.svg\\\" title=\\\"虎年\\\" alt=\\\"生肖\\\">\\n 2022年 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>递归查询树型结构数据的性能优化方案\",\"link\":\"/categories/solutions/2022/09/07/递归查询树型结构数据的性能优化方案\"}],\"collapsed\":false},{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>一条SQL查询今年每月统计信息\",\"link\":\"/categories/solutions/2021/11/22/一条SQL查询今年每月统计信息\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>用Java8获取近N天日期\",\"link\":\"/categories/solutions/2021/11/18/用Java8获取近N天日期\"}],\"collapsed\":true}],\"/categories/tools/\":[{\"text\":\"<img class=\\\"chinese-zodiac\\\" style=\\\"position: static; vertical-align: middle; padding-bottom: 3px;\\\" src=\\\"/img/svg/chinese-zodiac/ox.svg\\\" title=\\\"牛年\\\" alt=\\\"生肖\\\">\\n 2021年 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>Quartz 快速入门\",\"link\":\"/categories/tools/2021/03/10/Quartz快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Postman 快速入门\",\"link\":\"/categories/tools/2021/03/06/Postman快速入门\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>Another Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/03/04/ARDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>Redis Desktop Manager 快速入门\",\"link\":\"/categories/tools/2021/02/22/RDM快速入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>初识 Lombok\",\"link\":\"/categories/tools/2021/01/14/初识Lombok\"}],\"collapsed\":false}],\"/courses/java/\":[{\"text\":\"Java语法入门 (14篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>开发环境搭建\",\"link\":\"/courses/java/01-Java语法入门/01-开发环境搭建\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>第一个Java程序\",\"link\":\"/courses/java/01-Java语法入门/02-第一个Java程序\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>初识Eclipse\",\"link\":\"/courses/java/01-Java语法入门/03-初识Eclipse\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>程序和计算机的那点事儿\",\"link\":\"/courses/java/01-Java语法入门/04-程序和计算机的那点事儿\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>变量和常量\",\"link\":\"/courses/java/01-Java语法入门/05-变量和常量\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>常用的运算符\",\"link\":\"/courses/java/01-Java语法入门/06-常用的运算符\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>控制语句和流程图\",\"link\":\"/courses/java/01-Java语法入门/07-控制语句和流程图\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>if选择结构\",\"link\":\"/courses/java/01-Java语法入门/08-if选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">9</div>switch选择结构\",\"link\":\"/courses/java/01-Java语法入门/09-switch选择结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">10</div>循环结构\",\"link\":\"/courses/java/01-Java语法入门/10-循环结构\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">11</div>多重循环\",\"link\":\"/courses/java/01-Java语法入门/11-多重循环\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">12</div>程序调试入门\",\"link\":\"/courses/java/01-Java语法入门/12-程序调试入门\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">13</div>一维数组\",\"link\":\"/courses/java/01-Java语法入门/13-一维数组\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">14</div>多维数组\",\"link\":\"/courses/java/01-Java语法入门/14-多维数组\"}],\"collapsed\":false},{\"text\":\"Java面向对象 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>类和对象\",\"link\":\"/courses/java/02-Java面向对象/01-类和对象\"}],\"collapsed\":true},{\"text\":\"Java高级特性 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>集合与泛型-1\",\"link\":\"/courses/java/03-Java高级特性/01-集合与泛型-1\"}],\"collapsed\":true},{\"text\":\"附录 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 JDK 1.8.0_202\",\"link\":\"/courses/java/04-附录/01-CentOS安装JDK\"}],\"collapsed\":true}],\"/courses/mysql/\":[{\"text\":\"MySQL基础 (1篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>MySQL安装与配置\",\"link\":\"/courses/mysql/01-MySQL基础/01-MySQL安装与配置\"}],\"collapsed\":true},{\"text\":\"附录 (2篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>CentOS 8.2 安装 MySQL 5.7.39\",\"link\":\"/courses/mysql/03-附录/01-CentOS安装MySQL\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>Docker 安装 MySQL 详细步骤\",\"link\":\"/courses/mysql/03-附录/02-Docker安装MySQL\"}],\"collapsed\":false}],\"/courses/mybatis/\":[{\"text\":\"MyBatis基础 (8篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>快速入门\",\"link\":\"/courses/mybatis/01-MyBatis基础/01-快速入门\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>核心对象\",\"link\":\"/courses/mybatis/01-MyBatis基础/02-核心对象\"},{\"text\":\"<div class=\\\"text-color-yellow mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">3</div>核心配置文件\",\"link\":\"/courses/mybatis/01-MyBatis基础/03-核心配置文件\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>SQL映射文件之查询元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/04-SQL映射文件之查询元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>SQL映射文件之增删改元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/05-SQL映射文件之增删改元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">6</div>SQL映射文件之自定义映射元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/06-SQL映射文件之自定义映射元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">7</div>SQL映射文件之缓存元素\",\"link\":\"/courses/mybatis/01-MyBatis基础/07-SQL映射文件之缓存元素\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">8</div>动态SQL\",\"link\":\"/courses/mybatis/01-MyBatis基础/08-动态SQL\"}],\"collapsed\":false},{\"text\":\"MyBatis-Plus基础 (5篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; 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