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display: inline-block;">1</div>开发环境搭建</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/02-%E7%AC%AC%E4%B8%80%E4%B8%AAJava%E7%A8%8B%E5%BA%8F" 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>第一个Java程序</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/03-%E5%88%9D%E8%AF%86Eclipse" 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>初识Eclipse</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/04-%E7%A8%8B%E5%BA%8F%E5%92%8C%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%9A%84%E9%82%A3%E7%82%B9%E4%BA%8B%E5%84%BF" 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>程序和计算机的那点事儿</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/05-%E5%8F%98%E9%87%8F%E5%92%8C%E5%B8%B8%E9%87%8F" 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>变量和常量</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/06-%E5%B8%B8%E7%94%A8%E7%9A%84%E8%BF%90%E7%AE%97%E7%AC%A6" 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>常用的运算符</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/07-%E6%8E%A7%E5%88%B6%E8%AF%AD%E5%8F%A5%E5%92%8C%E6%B5%81%E7%A8%8B%E5%9B%BE" 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>控制语句和流程图</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/08-if%E9%80%89%E6%8B%A9%E7%BB%93%E6%9E%84" 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>if选择结构</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/09-switch%E9%80%89%E6%8B%A9%E7%BB%93%E6%9E%84" 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>switch选择结构</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/10-%E5%BE%AA%E7%8E%AF%E7%BB%93%E6%9E%84" 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>循环结构</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/11-%E5%A4%9A%E9%87%8D%E5%BE%AA%E7%8E%AF" 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>多重循环</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/12-%E7%A8%8B%E5%BA%8F%E8%B0%83%E8%AF%95%E5%85%A5%E9%97%A8" 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>程序调试入门</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/13-%E4%B8%80%E7%BB%B4%E6%95%B0%E7%BB%84" 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>一维数组</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="/courses/java/01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8/14-%E5%A4%9A%E7%BB%B4%E6%95%B0%E7%BB%84" 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>多维数组</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>Java面向对象 (1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="/courses/java/02-Java%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/01-%E7%B1%BB%E5%92%8C%E5%AF%B9%E8%B1%A1" 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>类和对象</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>Java高级特性 (1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="/courses/java/03-Java%E9%AB%98%E7%BA%A7%E7%89%B9%E6%80%A7/01-%E9%9B%86%E5%90%88%E4%B8%8E%E6%B3%9B%E5%9E%8B-1" 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>集合与泛型-1</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>附录 (1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="/courses/java/04-%E9%99%84%E5%BD%95/01-CentOS%E5%AE%89%E8%A3%85JDK" 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>CentOS 8.2 安装 JDK 1.8.0_202</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 _courses_java_01-Java%E8%AF%AD%E6%B3%95%E5%85%A5%E9%97%A8_13-%E4%B8%80%E7%BB%B4%E6%95%B0%E7%BB%84" data-v-53ed897c><div><h1 id="一维数组" tabindex="-1">一维数组 <a class="header-anchor" href="#一维数组" aria-label="Permalink to &quot;一维数组&quot;">​</a></h1><!----><h2 id="前言" tabindex="-1">前言 <a class="header-anchor" href="#前言" aria-label="Permalink to &quot;前言&quot;">​</a></h2><p><strong>C：</strong> 循环是 Java 语法上的一个小坎儿，跨过来之后，我们马上就要从语法入门上岸了。</p><p>本篇，笔者要带着你学习， Java 语法入门的一个进阶知识，数据结构：数组。</p><p>在目前已学的 Java 知识中，如果我们想利用程序，存储一个成绩数据，如下所示即可。</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;">// 声明一个变量，存储成绩</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span></code></pre></div><p>但当我们要存储并使用5个、10个，甚至更多成绩数据时，变量这种单一存储的方式，其效率及使用将变得不太友好。</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;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score2</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score3</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score4</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score5</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 59</span><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>所以我们需要一种更为先进的，能够同时存储多个数据、并方便使用的存储方式。</p><img src="/assets/202010091351206.u8FjLPy-.jpg" width="50%"><h2 id="数据结构概述" tabindex="-1">数据结构概述 <a class="header-anchor" href="#数据结构概述" aria-label="Permalink to &quot;数据结构概述&quot;">​</a></h2><p>在开始介绍数组前，我们先来普及一下数据结构的基本概念。</p><div class="tip custom-block"><p class="custom-block-title">《数据结构与算法》</p><p>数据结构是计算机存储、组织数据的方式。</p><p>数据结构是指相互之间存在一种或多种特定关系的数据元素的集合。通常情况下，精心选择的数据结构可以带来更高的运行或者存储效率。数据结构往往同高效的检索算法和索引技术有关。[1]</p></div><p>数据结构有很多种，一般来说，按照数据的逻辑结构对其进行简单的分类，包括线性结构（线性表）和非线性结构（非线性表）两类。[2]</p><ol><li><p>线性表（Linear List），就是表中各个结点具有线性关系。数据排成像一条线一样的结构。[3]</p><p>常见的线性表数据结构有：数组，队列、栈、链表等。</p><p><img src="/assets/202010091351392.XmlFjXCL.png" alt="202010091351392"></p></li><li><p>非线性表，就是表中各个结点之间具有多个对应关系。[2]</p><p>常见的非线性表数据结构有：树、图等。</p><p><img src="/assets/202010091351582.OVUj18jQ.png" alt="202010091351582"></p></li></ol><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>数据结构在计算机系是一门非常重要的基础学科。数据结构产生的目的，就是为了让计算机能够以更加简单、高效、便捷的方式来 <strong>存储</strong> 和 <strong>使用</strong> 数据。</p></div><img src="/assets/202010091351666.y3waBGRT.jpg" width="60%"><h2 id="数组概述" tabindex="-1">数组概述 <a class="header-anchor" href="#数组概述" aria-label="Permalink to &quot;数组概述&quot;">​</a></h2><p>数组是线性数据结构中最为基础，最为典型的一种顺序型结构。它用一组 <strong>连续的内存空间</strong> ，来存储一组具有 <strong>相同类型</strong> 的数据。[3]</p><p>我们拿变量和数组来对比一下：</p><ul><li>变量：就是在内存中划出 <strong>一块合适</strong> 的空间。</li><li>数组：就是在内存中划出 <strong>一串连续</strong> 的空间。</li></ul><p><img src="/assets/202010091352057.1kmXwLTb.png" alt="202010091352057"></p><h2 id="数组组成" tabindex="-1">数组组成 <a class="header-anchor" href="#数组组成" aria-label="Permalink to &quot;数组组成&quot;">​</a></h2><p>我们也再拿变量的组成要素，和数组来对比一下。</p><table><thead><tr><th style="text-align:left;">变量</th><th style="text-align:left;">数组</th></tr></thead><tbody><tr><td style="text-align:left;">变量值</td><td style="text-align:left;"><strong>数组元素</strong> ：在数组中存储的数据</td></tr><tr><td style="text-align:left;">变量数据类型</td><td style="text-align:left;"><strong>数组元素的类型</strong> ：在数组中存储的数据都必须是相同的数据类型</td></tr><tr><td style="text-align:left;">变量名</td><td style="text-align:left;"><strong>数组名</strong> ：用于区分不同的数组，命名规范同变量名一致</td></tr><tr><td style="text-align:left;"></td><td style="text-align:left;"><strong>数组容量</strong> ：数组中可以存储多少个元素</td></tr><tr><td style="text-align:left;"></td><td style="text-align:left;"><strong>数组下标/索引</strong> ：数组是一串连续的空间，每个空间都有其相应的 &quot;序号&quot;， <strong>从0开始计数</strong></td></tr></tbody></table><p><img src="/assets/202010091352212.Sgk3ju0n.png" alt="202010091352212"></p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p><strong>数组的下标是由数组的容量（长度）决定的</strong> 。数组的容量为5，那么数组的下标就是0、1、2、3、4。数组容量一经定义，就不可再变。</p></div><h2 id="数组定义" tabindex="-1">数组定义 <a class="header-anchor" href="#数组定义" aria-label="Permalink to &quot;数组定义&quot;">​</a></h2><p>了解完数组的组成，接下来，我们亲自定义一个数组来使用。在 Java 中，数组的定义方式很灵活，笔者带你认识两种比较常见的定义方式。</p><h3 id="方式一" tabindex="-1">方式一 <a class="header-anchor" href="#方式一" aria-label="Permalink to &quot;方式一&quot;">​</a></h3><p>第一种数组定义方式为：先声明好数组，再给数组赋值。</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;">// 声明数组语法</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">数据类型[] 数组名 </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;"> 数据类型[数组容量];</span></span></code></pre></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;">// 数组赋值语法</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">数组名[下标] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> 元素值;</span></span></code></pre></div><p>这种是最传统的数组定义方式了。通过指定好数据类型及数组容量，来划定好一串连续的空间，就可以来存储数据了。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>声明数组的语法长得和变量定义方式类似，就是多了个 <code>new</code> 关键字，这个关键字我们在使用 Scanner 时也用过，以后笔者会告诉你它的含义的，先记住语法。</p></div><p>好了，回到我们前言中提过的需求，来使用方式一实现一下。</p><details class="details custom-block"><summary>案例需求：存储班级内5名同学的成绩，成绩分别为：90、80、70、60、50。</summary><p><strong>思路分析：</strong></p><ol><li>根据需求，由于要进行多个数据的存储，采用数组更为合适</li><li>确定数组的各个组成 <ul><li><p>数组元素：成绩</p></li><li><p>数组元素的类型：double</p></li><li><p>数组名：scores（一个成绩常被命名为：score，多个成绩则可命名为复数形式：scores）</p></li><li><p>数组容量（决定下标）：5</p></li></ul></li><li>根据数组组成，套用方式一的数组语法实现</li></ol></details><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;">// 声明一个长度为5，用来存储 double 类型数据的数组</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">// 给数组赋值</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 把 90 赋值给数组的第1个空间</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 把 80 赋值给数组的第2个空间</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 把 70 赋值给数组的第3个空间</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 把 60 赋值给数组的第4个空间</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">3</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 把 50 赋值给数组的第5个空间</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">4</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 50</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span></code></pre></div><p>存储好了数据，在使用数据的时候，也是需要借助数组名和数组下标来进行的。</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;">// 使用语法：数组名[下标]</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;">(scores[</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;">// 90.0</span></span></code></pre></div><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>下标是从 0 开始计数的，所以极其容易出现，超出数组容量范围的使用问题。例如：<code>scores[5] = 40;</code><br> 而且这种问题，在编译期不报错，在运行时才报错（数组越界异常），需要各位同学多加小心，反复用注释等方式提醒自己。</p></div><h3 id="方式二" tabindex="-1">方式二 <a class="header-anchor" href="#方式二" aria-label="Permalink to &quot;方式二&quot;">​</a></h3><p>方式一的定义方式，需要先声明一个数组，然后再进行赋值操作。步骤中规中矩，如果想快速获得一个赋值好的数组，可以通过下方的语法来实现。</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;">// 声明数组时赋值</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 语法</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">数据类型[] 数组名 </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {元素1, 元素2, ....};</span></span></code></pre></div><p>这种定义方式，非常适合快速定义一个有值数组的情况。不需要指定容量，数组会根据元素的数量指定好容量。</p><p>我们来通过方式二语法，改造一下刚才的需求实现。</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;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">50</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">};</span></span></code></pre></div><p>声明数组时赋值，还可以写成下方这样。</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;">// 声明数组时赋值</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 语法：</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">数据类型[] 数组名 </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;"> 数据类型[] {元素1, 元素2, ...};</span></span></code></pre></div><p>再改造下刚才的需求实现。</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;">// 注意：有[]，也不需要指定数组容量，它是空的，不是笔者写错了</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[] {</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">50</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">};</span></span></code></pre></div><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>肯定有同学会问：这种定义方式，和上方几乎一模一样，再学习有什么用？别着急，后续在一些篇章的场景中，这种写法可能是你使用数组唯一的、更好的选择，相信笔者。</p></div><h2 id="数组的默认值" tabindex="-1">数组的默认值 <a class="header-anchor" href="#数组的默认值" aria-label="Permalink to &quot;数组的默认值&quot;">​</a></h2><p>在原来，我们声明了一个局部变量后，如果不赋值，是无法使用的。而声明好数组之后，如果你不进行任何赋值就直接来使用，却会发现数组的各个空间竟然都有值。</p><p>这是因为在数组声明时，会伴随一个初始化动作，初始化动作就是对数组每一个空间， <strong>根据数组元素数据类型</strong> ，来设置一个默认值的过程。</p><ul><li>整数型数组（byte、short、int、long）：默认值为0</li><li>浮点型数组（float、double）：默认值为0.0</li><li>布尔型数组（boolean）：默认值为false</li><li>字符型数组（char）：默认值为一个空格（\u0000）</li><li>字符串型数组（String）：默认值为 null</li></ul><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p><code>null</code> 是一种特殊的值，后期，我们在讲解引用数据类型时会再提到。</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:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">dArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">(dArr[</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;">// 0.0</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">iArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">(iArr[</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;">// 0</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">bArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">(bArr[</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>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">char</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">cArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> char</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">(cArr[</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;">// 一个空格，\U0000</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">String</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">sArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> String</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">(sArr[</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;">// null</span></span></code></pre></div><h2 id="动态赋值" tabindex="-1">动态赋值 <a class="header-anchor" href="#动态赋值" aria-label="Permalink to &quot;动态赋值&quot;">​</a></h2><p>在方式一的赋值中，学习过循环的我们，很快就能发现一些重复性，有规律性的操作。</p><p><img src="/assets/202010091352999.8-qH-3w0.png" alt="202010091352999"></p><p>如果我们再结合上 Scanner 键盘输入，就可以将数组的赋值变为动态形式的。</p><p><strong>思路分析：</strong></p><ol><li>根据效果图分析，只有单个规律，采用单层循环即可</li><li>确定循环要素 <ul><li><p>循环条件： <code>&lt; 数组长度</code></p></li><li><p>循环操作： 数组名[循环变量] = 输入的元素值;</p></li></ul></li><li>固定次数循环，采用 for 循环</li><li>检查循环是否可以正常退出</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:#6A737D;--shiki-dark:#768390;">// 声明数组，存储5个同学成绩</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">// 动态录入学生成绩</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(System.in);</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 数组名.length 可以获取数组的容量</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scores.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</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;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;请输入第&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (i</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 style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;个学生成绩：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scores[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">nextDouble</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:#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;第3名同学成绩：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scores[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">]);</span></span></code></pre></div><h2 id="数组遍历" tabindex="-1">数组遍历 <a class="header-anchor" href="#数组遍历" aria-label="Permalink to &quot;数组遍历&quot;">​</a></h2><p>在动态赋值的实现中，我们巧妙利用了循环，实现了数组赋值的规律。其实在从数组取值过程中，依然存在此规律。在数组的常见操作中，有一种叫做遍历的概念会经常出现。</p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p><strong>遍历：</strong> 将数组中的元素挨个取出来的过程，就叫遍历。</p></div><p>接下来，我们看看，如何才能实现数组的遍历。</p><h3 id="循环下标遍历" tabindex="-1">循环下标遍历 <a class="header-anchor" href="#循环下标遍历" aria-label="Permalink to &quot;循环下标遍历&quot;">​</a></h3><p>最常见的遍历方式，就是通过循环数组的下标，来进行遍历。刚才我们动态赋值就是用的这种循环规律。</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;">// 定义数组</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">50</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;">// 循环所有的下标，然后根据下标取值</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scores.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 数组名[循环下标]</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;">(scores[i]);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><h3 id="foreach遍历" tabindex="-1">forEach遍历 <a class="header-anchor" href="#foreach遍历" aria-label="Permalink to &quot;forEach遍历&quot;">​</a></h3><p>除此之外，还有一种较为特别的方式：使用 forEach 循环（俗称增强 for 循环）遍历。这种遍历方式，主要强调的就是将数组中的元素挨个取出来，每次都临时存储到一个变量中。</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;">// 声明数组并赋值</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scores</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">90</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">80</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">70</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">60</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">50</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;">// for (数组元素数据类型 变量名 : 要遍历的数组名)</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// score 是在循环中，临时存储每一个元素的变量</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> score</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> :</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scores) {</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;">(score);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">}</span></span></code></pre></div><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>增强 for 循环遍历方式与循环下标遍历相比，在使用时更简单，但前期可能不太好理解，如果实在理解不好的话，就先用循环下标的遍历方式。而且有些时候，我们需要下标来作为辅助计算因素时，采用循环下标遍历更方便。</p></div><h2 id="数组使用" tabindex="-1">数组使用 <a class="header-anchor" href="#数组使用" aria-label="Permalink to &quot;数组使用&quot;">​</a></h2><p>光说不练假把式，接下来我们通过数组来解决一些需求问题。</p><h3 id="打印消费记录" tabindex="-1">打印消费记录 <a class="header-anchor" href="#打印消费记录" aria-label="Permalink to &quot;打印消费记录&quot;">​</a></h3><p><strong>案例需求：根据效果图实现，会员消费清单打印。</strong></p><p><img src="/assets/202010091353559.cqQS9c45.png" alt="202010091353559"></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;">// 声明一个长度为5的数组，用来存储本月消费记录</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">records</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</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;">// 动态赋值</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(System.in);</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;请输入会员本月的消费记录：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> records.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</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;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;请输入第&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (i</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 style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;笔购物金额：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> records[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">nextDouble</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:#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>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 声明变量，存储消费总金额</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</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;序号</span><span style="--shiki-light:#005CC5;--shiki-dark:#F47067;">\t\t</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">金额(元)&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> records.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</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;">((i</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 style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;</span><span style="--shiki-light:#005CC5;--shiki-dark:#F47067;">\t\t</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> records[i]);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> records[i];</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;">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;总金额</span><span style="--shiki-light:#005CC5;--shiki-dark:#F47067;">\t\t</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum);</span></span></code></pre></div><h3 id="猜数字" tabindex="-1">猜数字 <a class="header-anchor" href="#猜数字" aria-label="Permalink to &quot;猜数字&quot;">​</a></h3><p><strong>案例需求：有一个数列：8，4，2，1，23，344，12。</strong></p><ol><li>循环输出数列的值</li><li>求数列中所有数值的和</li><li><strong>猜数游戏：</strong> 从键盘中任意输入一个数据，判断数列中是否包含此数</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:#6A737D;--shiki-dark:#768390;">// 声明数组，存储好数列的值</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">numArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> {</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">8</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">4</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;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">23</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">344</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">12</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;">// 1.循环输出数列的值 </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;数列中的值有：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> num</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> :</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> numArr) {</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;">(num);</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;">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;-------------------------&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;">// 2.求数列中所有数值的和 </span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> numArr.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> numArr[i];</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;">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;数列的所有数值的和为：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> sum);</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;-------------------------&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;">// 3.猜数游戏：从键盘中任意输入一个数据，判断数列中是否包含此数 </span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 3.1 从键盘中任意输入一个数据</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(System.in);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">System.out.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;请输入一个数值：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">nextInt</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;">// 3.2 判断数列中是否包含此数 </span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 标志位</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">boolean</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> false</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; </span><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 假设数列中不包含此值</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> numArr.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</span><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;"> (numArr[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">==</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> num) {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> flag </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</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:#D73A49;--shiki-dark:#F47067;"> break</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:#24292E;--shiki-dark:#ADBAC7;">}</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 3.3 判断标志位</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (flag) {</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;数列中包含此值！&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">} </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">else</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;数列中不包含此值！&quot;</span><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><h3 id="求最高分" tabindex="-1">求最高分 <a class="header-anchor" href="#求最高分" aria-label="Permalink to &quot;求最高分&quot;">​</a></h3><p><strong>案例需求：从键盘输入本次Java考试五位学生的成绩，求考试成绩最高分。</strong></p><div class="tip custom-block"><p class="custom-block-title">笔者说</p><p>武侠电视剧中，经常上演 &quot;文无第一，武无第二&quot; 的戏码。比武招亲或武林大会：最开始有一个守擂的，随后有各大侠士争相对抗，赢的就成为新的守擂者，等结束剩下的就是最强的。</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;">// 1.从键盘输入本次 Java 考试五位学生的成绩</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">scoreArr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">5</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">]; </span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(System.in);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scoreArr.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</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;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;请输入第&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (i </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 style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;位学生的成绩：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scoreArr[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">nextDouble</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;">// 2.求考试成绩最高分</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 假定一个最高分(从要比较的数据中假定一个数据)</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> max</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scoreArr[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">];</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> score</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> :</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> scoreArr) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 如果挨个比较过程中，有比max还大的值</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 那就将max的值换为最新的数据</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (score </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> max) {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> max </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> score;</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>
<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;最高分为：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> max);</span></span></code></pre></div><h3 id="求最低价" tabindex="-1">求最低价 <a class="header-anchor" href="#求最低价" aria-label="Permalink to &quot;求最低价&quot;">​</a></h3><p><strong>案例需求：输入4家手机店的 OnePlus 8T 价格，输出哪家店价格最低及最低手机价格。</strong></p><p><img src="/assets/202010091355285.-8S1J7IB.png" alt="202010091355285"></p><p>这道题和上一题是一个思路，我们来实现一下。</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;">// 声明数组，存储4家店手机价格</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#F69D50;">[] </span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">prices</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">4</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;">// 动态赋值</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;"> Scanner</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(System.in);</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;请输入4家店的 OnePlus 8T 手机价格：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> prices.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</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;">print</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;">&quot;第&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (i</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 style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;家店的价格：&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> prices[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> input.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#DCBDFB;">nextDouble</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;">// 声明变量，假定最低价格为第1家</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">double</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> min</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> prices[</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">];</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;">// 声明变量，存储最低价格是第几家</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">int</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> minStore</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;">for</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;"> i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#6CB6FF;"> 0</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">; i </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> prices.length; i</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">++</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;">) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 如果有比最低价格还低的</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> if</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> (prices[i] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">&lt;</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> min) {</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 更换最低价格</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> min </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> prices[i];</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#768390;"> // 更换最低价格店铺</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> minStore </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> i </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:#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:#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;第&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> minStore </span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;">+</span><span style="--shiki-light:#032F62;--shiki-dark:#96D0FF;"> &quot;家价格最低，价格为：&quot;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F47067;"> +</span><span style="--shiki-light:#24292E;--shiki-dark:#ADBAC7;"> min);</span></span></code></pre></div><h2 id="答题环节" tabindex="-1">答题环节 <a class="header-anchor" href="#答题环节" aria-label="Permalink to &quot;答题环节&quot;">​</a></h2><p>下方这些题大多来自于互联网，笔者收集汇总在一起，针对性的练习一下。</p><h3 id="求最小值" tabindex="-1">求最小值 <a class="header-anchor" href="#求最小值" aria-label="Permalink to &quot;求最小值&quot;">​</a></h3><p><strong>需求：获取指定数组中偶数元素值的最小值</strong></p><ol><li>定义一个 int 数组 arr</li><li>键盘录入5个整数，存入数组 arr 中，并且录入之前提示输入的是第几个数字</li><li>获取指定数组 arr 中偶数元素值的最小值，并在控制台打印</li></ol><h3 id="求差值" tabindex="-1">求差值 <a class="header-anchor" href="#求差值" aria-label="Permalink to &quot;求差值&quot;">​</a></h3><p><strong>需求1：获取到数组中最大值和最小值的差值</strong></p><ol><li>获取键盘录入的5个整数，并存放在 int 数组 arr 中，输入前提示输入的是第几个值。</li><li>分别获取数组中最大值和最小值，并计算差值。</li><li>输出差值。</li></ol><p><strong>需求2：获取数组元素的偶数和与奇数和之差</strong></p><ol><li><p>获取键盘录入的5个整数，并存放在 int 数组 arr 中，输入前提示输入的是第几个值;</p></li><li><p>分别获取数组中元素的偶数和与奇数和;</p></li><li><p>输出偶数和与奇数和的差值</p></li></ol><h3 id="个数统计" tabindex="-1">个数统计 <a class="header-anchor" href="#个数统计" aria-label="Permalink to &quot;个数统计&quot;">​</a></h3><p><strong>需求1：获取指定数组中元素值为偶数的元素个数</strong></p><ol><li>定义一个整数数组 arr</li><li>获取5个0~50之间（包含0和50）的随机数，并存入 arr</li><li>获取指定数组 arr 中元素值为偶数的元素个数，并打印</li></ol><p><strong>需求2：获取指定数组中大于指定整数的元素个数</strong></p><ol><li><p>获取键盘录入的5个整数，并存放在 int 数组 arr 中，输入前提示输入的是第几个值</p></li><li><p>键盘录入一个需要进行比较的整数 num</p></li><li><p>计算数组 arr 中比整数 num 大的元素个数</p></li></ol><h3 id="查询下标" tabindex="-1">查询下标 <a class="header-anchor" href="#查询下标" aria-label="Permalink to &quot;查询下标&quot;">​</a></h3><p><strong>需求：查询指定元素值在指定数组中的下标值</strong></p><ol><li>创建 int 数组 arr，arr 包含11, 32，55, 47，55, 79，23</li><li>输入任意一个整数 num</li><li>遍历数组，如果指定数组 arr 中不存在指定整数 num，那么输出 -1，指定数组 arr 中存在多个相同的指定整数 num，那么输出 num 值对应的最大角标值（最后的num对应的角标）</li></ol><h3 id="替换值" tabindex="-1">替换值 <a class="header-anchor" href="#替换值" aria-label="Permalink to &quot;替换值&quot;">​</a></h3><p><strong>需求：用指定整数替换指定数组中的元素值</strong></p><ol><li><p>创建 int 数组 arr，数组内包含0-9之间的10个整数</p></li><li><p>获取键盘录入的一个整数 num，如果 num 为偶数，则用 num 替换指定数组 arr 中的所有偶数下标的元素值</p><p>如果 num 为奇数，则用 num 替换指定数组 arr 中所有的奇数下标的元素值</p></li><li><p>输出替换值之后的数组 arr</p></li></ol><h3 id="去除值" tabindex="-1">去除值 <a class="header-anchor" href="#去除值" aria-label="Permalink to &quot;去除值&quot;">​</a></h3><p><strong>需求：去除数组中所有的数值0</strong></p><ol><li><p>定义一个数组 oldArr，元素为1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5</p></li><li><p>去除所有为 0 的元素值，并存入到一个新的数组 newArr，效果为1,3,4,5,6,6,5,4,7,6,7,5</p></li><li><p>分别遍历两个数组</p></li></ol><h3 id="互换值" tabindex="-1">互换值 <a class="header-anchor" href="#互换值" aria-label="Permalink to &quot;互换值&quot;">​</a></h3><p><strong>需求：将指定数组元素值的位置前后互换，例如：[11, 32，55, 47，79，23] 置换后的数组元素为：</strong><strong>[23, 79, 47, 55, 32, 11]</strong></p><ol><li>定义一个整数数组 arr</li><li>键盘录入5个整数，并存入数组 arr</li><li>定义一个新数组 newArr</li><li>将指定数组 arr 的元素值的位置前后互换，并存储到新数组 newArr 中</li><li>在控制台分别横向打印 arr 和 newArr 的内容</li></ol><h3 id="获取随机值" tabindex="-1">获取随机值 <a class="header-anchor" href="#获取随机值" aria-label="Permalink to &quot;获取随机值&quot;">​</a></h3><p><strong>需求1：获取指定数组中随机的2个元素值</strong></p><ol><li>定义一个 int 数组 arr</li><li>键盘录入5个整数，存入数组 arr 中,并且录入之前提示输入的是第几个数字</li><li>随机获取数组中的两个元素值并在控制台打印</li></ol><p><strong>需求2：随机获取4个A-Z之间（包含A和Z）的大写字母</strong></p><ol><li><p>定义一个 char 数组 arr</p></li><li><p>生成A-Z之间的26个大写字母，并存入数组 arr 中</p></li><li><p>从 arr 数组中获取4个随机大写字母。</p></li></ol><h3 id="字符串的拼接" tabindex="-1">字符串的拼接 <a class="header-anchor" href="#字符串的拼接" aria-label="Permalink to &quot;字符串的拼接&quot;">​</a></h3><p><strong>需求：获取指定字符数组中下标为奇数的所有字符，并连接成一个字符串</strong></p><ol><li>创建字符数组，数组包含 26 个大写字符及 0-9 字符</li><li>获取指定字符数组中，下标为奇数的所有字符，并连接成一个字符串</li><li>将字符串打印在控制台上</li></ol><h2 id="参考文献" tabindex="-1">参考文献 <a class="header-anchor" href="#参考文献" aria-label="Permalink to &quot;参考文献&quot;">​</a></h2><p>[1]彭军、向毅主编．数据结构与算法：人民邮电出版社，2013年</p><p>[2]刘亚东；曲心慧编．C/C++常用算法手册：中国铁道出版社，2017.09：第21页</p><p>[3]冯小圆. 数据结构之数组[EB/OL]. <a href="https://www.cnblogs.com/fengxiaoyuan/p/10934399.html" target="_blank" rel="noreferrer">https://www.cnblogs.com/fengxiaoyuan/p/10934399.html</a>. 2019-05-27</p><h2 id="后记" tabindex="-1">后记 <a class="header-anchor" href="#后记" aria-label="Permalink to &quot;后记&quot;">​</a></h2><p>有了数组这一数据结构之后，多个数据存储及使用变得更加方便，随之而来的就是一些算法题型的解锁，笔者在本篇的作业中汇总了10来道练习题，希望你能通过解决这些问题，来锻炼下自己的逻辑思维。</p><p>做不出来也别着急，你还可以评论求助笔者来给你参考答案。</p><p><img src="/assets/202010091355395.7KbptVqN.jpg" alt="202010091355395"></p><p>最后别忘了，牢记学习数组的原因：因为前面的数据存储方式，已经不能满足我们日益复杂的需求。而且，数组作为一种典型的，基础的线性表数据结构，有其存储上的优势。</p><p>它在查找方法因为有下标的存在，效率较为不错，所以 <strong>适合增删情况较少，查取数据较多的场景</strong> 。但它也有不足之处：它只能存储一组定长的具有相同数据类型的数据。</p><div class="info custom-block"><p class="custom-block-title">笔者说</p><p>对于技术的学习，笔者一贯遵循的步骤是：先用最最简单的 demo 让它跑起来，然后学学它的最最常用 API 和 配置让自己能用起来，最后熟练使用的基础上，在空闲时尝试阅读它的源码让自己能够洞彻它的运行机制，部分问题出现的原因，同时借鉴这些技术实现来提升自己的代码高度。</p><p>所以在笔者的文章中，前期基本都是小白文，仅仅穿插很少量的源码研究。当然等小白文更新多了，你们还依然喜欢，后期会不定时专门对部分技术的源码进行解析。</p></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 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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 (12篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">1</div>解决 Maven 传递依赖污染的问题\",\"link\":\"/categories/issues/2022/11/23/解决Maven传递依赖污染的问题\"},{\"text\":\"<div class=\\\"text-color-orange mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">2</div>解决 DotNet 安装完，报错：Couldn't find a valid ICU package installed on the system. 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Shorten command line for XXX or also for Spring Boot default configuration？\",\"link\":\"/categories/issues/2021/12/10/Command line is too long. Shorten command line for XXX or also for Spring Boot default configuration\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">4</div>for循环中删除集合元素隐藏的陷阱\",\"link\":\"/categories/issues/2021/12/08/for循环中删除集合元素隐藏的陷阱\"},{\"text\":\"<div class=\\\"text-color-gray mr-[6px]\\\" style=\\\"font-weight: 550; display: inline-block;\\\">5</div>F:\\\\ 上的回收站已损坏。是否清空该驱动器上的\\\"回收站\\\"?\",\"link\":\"/categories/issues/2021/12/01/F盘上的回收站已损坏。是否清空该驱动器上的回收站\"}],\"collapsed\":true}],\"/categories/fragments/\":[{\"text\":\"<svg style=\\\"display: inline-block; vertical-align: middle; padding-bottom: 3px;\\\" viewBox=\\\"0 0 1920 1024\\\" version=\\\"1.1\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\" width=\\\"30\\\" height=\\\"30\\\"><path d=\\\"M367.488 667.904h423.744v47.232H367.488v-47.232zM320.256 204.352h137.28v68.992h-137.28v-68.992zM367.488 754.112h423.744v48H367.488v-48zM693.76 204.352h137.984v68.992H693.76v-68.992zM507.008 204.352h137.28v68.992h-137.28v-68.992z\\\" p-id=\\\"10749\\\" fill=\\\"#d81e06\\\"></path><path d=\\\"M1792.512 0H127.488C57.472 0 0 57.152 0 127.616v768.768C0 966.72 57.088 1024 127.488 1024h1665.088c69.952 0 127.424-57.152 127.424-127.616V127.616C1920 57.216 1862.912 0 1792.512 0z m-528 175.104h446.976v54.016H1494.72l-24 101.248h206.976V689.6h-57.728V384.32h-289.472v308.224h-57.728v-362.24h140.224l20.992-101.248h-169.472v-53.952z m-996.032-11.2h614.272v167.232h-51.008v-17.28H320.256v17.28H268.48V163.904z m678.784 681.728h-744v-43.52h111.744V454.848h229.504v-48.704H221.248v-42.048h323.264v-39.744h54.016v39.744h331.52v41.984h-331.52v48.768h245.248v347.264h103.488v43.52z m203.264-94.528c0 59.52-30.72 89.28-92.224 89.28-25.472 0-46.016-0.512-61.504-1.472-2.496-22.976-6.528-45.248-12.032-66.752 22.976 5.504 46.72 8.256 71.232 8.256 24 0 35.968-11.52 35.968-34.496V247.872H971.2v-54.72h278.976v54.72H1150.4v503.232z m521.216 121.536c-67.008-55.488-137.28-108.032-210.752-157.504-4.992 9.984-10.496 19.008-16.512 27.008-41.472 57.024-113.28 101.504-215.232 133.504-9.472-16.512-21.504-34.496-35.968-54.016 94.528-27.008 161.28-64.512 200.256-112.512 34.496-44.992 51.776-113.024 51.776-204.032V421.12h57.728v82.496c0 62.528-6.72 115.776-20.224 159.744 84.48 54.016 161.472 107.008 230.976 158.976l-42.048 50.304z\\\" p-id=\\\"10750\\\" fill=\\\"#d81e06\\\"></path><path d=\\\"M367.488 495.36h423.744v47.232H367.488V495.36zM367.488 581.632h423.744v47.232H367.488v-47.232z\\\" p-id=\\\"10751\\\" fill=\\\"#d81e06\\\"></path></svg>\\n 我的置顶 (8篇)\",\"items\":[{\"text\":\"<div class=\\\"text-color-red mr-[6px]\\\" style=\\\"font-weight: 550; 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; 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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; 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