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<html lang="zh"><head><meta charset="utf-8"><meta name="generator" content="Hexo 4.2.1"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><meta><title>Java-4流程控制 - 蒋志伟的个人网站</title><meta description="流程控制：程序需要根据不同的条件去进行不同的流程处理，在程序中我们称之为流程控制。举例：用户输入4位卡号，每位数字之和大于20，中奖，小于20则不中奖。 if语法：if(判断条件){ &#x2F;&#x2F;条件成立}else{ &#x2F;&#x2F;条件不成立} if-esle是Java中最基本的流程控制语句if后面必须跟(条件)else后面不能有(),可以直接跟{}也可以再跟一个if()else{}可以继续嵌套if语句"><meta property="og:type" content="blog"><meta property="og:title" content="Java-4流程控制"><meta property="og:url" content="https://jiangzhiwei.cn/Java-4%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6.html"><meta property="og:site_name" content="蒋志伟的个人网站"><meta property="og:description" content="流程控制：程序需要根据不同的条件去进行不同的流程处理，在程序中我们称之为流程控制。举例：用户输入4位卡号，每位数字之和大于20，中奖，小于20则不中奖。 if语法：if(判断条件){ &#x2F;&#x2F;条件成立}else{ &#x2F;&#x2F;条件不成立} if-esle是Java中最基本的流程控制语句if后面必须跟(条件)else后面不能有(),可以直接跟{}也可以再跟一个if()else{}可以继续嵌套if语句"><meta property="og:locale" content="zh_CN"><meta property="og:image" content="https://jiangzhiwei.cn/img/og_image.png"><meta property="article:published_time" content="2019-06-01T13:30:20.000Z"><meta property="article:modified_time" content="2020-06-01T16:16:16.450Z"><meta property="article:author" content="蒋志伟"><meta property="article:tag" content="Java"><meta property="twitter:card" content="summary"><meta property="twitter:image" content="/img/og_image.png"><script type="application/ld+json">{"@context":"https://schema.org","@type":"BlogPosting","mainEntityOfPage":{"@type":"WebPage","@id":"https://jiangzhiwei.cn/Java-4%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6.html"},"headline":"蒋志伟的个人网站","image":["https://jiangzhiwei.cn/img/og_image.png"],"datePublished":"2019-06-01T13:30:20.000Z","dateModified":"2020-06-01T16:16:16.450Z","author":{"@type":"Person","name":"蒋志伟"},"description":"流程控制：程序需要根据不同的条件去进行不同的流程处理，在程序中我们称之为流程控制。举例：用户输入4位卡号，每位数字之和大于20，中奖，小于20则不中奖。 if语法：if(判断条件){ //条件成立}else{ //条件不成立} if-esle是Java中最基本的流程控制语句if后面必须跟(条件)else后面不能有(),可以直接跟{}也可以再跟一个if()else{}可以继续嵌套if语句"}</script><link rel="canonical" href="https://jiangzhiwei.cn/Java-4%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6.html"><link rel="alternative" href="/atom.xml" title="蒋志伟的个人网站" type="application/atom+xml"><link rel="icon" href="/img/myAvatar.jpg"><link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.12.0/css/all.css"><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/styles/atom-one-light.css"><link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Ubuntu:wght@400;600&family=Source+Code+Pro"><link rel="stylesheet" href="/css/default.css"><style>body>.footer,body>.navbar,body>.section{opacity:0}</style><!--!--><script>var _hmt = _hmt || [];
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<h3 id="if"><a href="#if" class="headerlink" title="if"></a>if</h3><p>语法：<br>if(判断条件){<br> //条件成立<br>}else{<br> //条件不成立<br>}</p>
<p>if-esle是Java中最基本的流程控制语句<br>if后面必须跟(条件)<br>else后面不能有(),可以直接跟{}<br>也可以再跟一个if()<br>else{}可以继续嵌套if语句</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 学校举办运动会，百米赛跑成绩13秒以内有资格进入决赛，根据性别分别进入男子组和女子组。</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test3</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"请输入张三的百米成绩"</span>);</span><br><span class="line"> Scanner scanner = <span class="keyword">new</span> Scanner(System.in);</span><br><span class="line"> <span class="keyword">int</span> score = scanner.nextInt();</span><br><span class="line"> System.out.println(<span class="string">"请输入张三的性别"</span>);</span><br><span class="line"> String gender = scanner.next();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span>(score<<span class="number">13</span>) {</span><br><span class="line"> <span class="keyword">if</span>(gender.equals(<span class="string">"男"</span>)) {</span><br><span class="line"> System.out.println(<span class="string">"进入男子组"</span>);</span><br><span class="line"> }<span class="keyword">else</span> {</span><br><span class="line"> System.out.println(<span class="string">"进入女子组"</span>);</span><br><span class="line"> }</span><br><span class="line"> }<span class="keyword">else</span> {</span><br><span class="line"> System.out.println(<span class="string">"很遗憾，你被淘汰了！！！"</span>);</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>String类型的值比较是否相等<br>不能用 ==<br>应该用equals方法进行判断</p>
<h3 id="switch-case"><a href="#switch-case" class="headerlink" title="switch case"></a>switch case</h3><p>语法：<br>switch(要判断的变量){<br> case 特定值1:<br> //<br> case 特定值2:<br> //<br> …<br>}<br>switch-case和if-else的区别是<br>switch-case只能处理等值判断，不能处理大于/小于判断<br>if-else任何判断都可以处理</p>
<p>如果变量满足某个case语句，<br>则会执行该语句的逻辑代码，同时<br>该case之后的所有case不再做判断，<br>统一认为全部满足，逻辑代码都会执行。</p>
<p>如何解决：<br>在每一个case的逻辑代码结束之后，添加break;</p>
<p>switch支持的数据类型：<br>int，short，byte，char<br>枚举类型，String类型 (jdk1.7之后的版本支持)</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test4</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> System.out.println(<span class="string">"请输入一个数字"</span>);</span><br><span class="line"> Scanner scanner = <span class="keyword">new</span> Scanner(System.in);</span><br><span class="line"> String str = <span class="string">""</span>;</span><br><span class="line"> <span class="keyword">switch</span>(str) {</span><br><span class="line"> <span class="keyword">case</span> <span class="string">"1"</span>:</span><br><span class="line"> System.out.println(<span class="string">"中了一个三等奖"</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="string">"20"</span>:</span><br><span class="line"> System.out.println(<span class="string">"中了二等奖"</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="string">"30"</span>:</span><br><span class="line"> System.out.println(<span class="string">"中了一等奖"</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> System.out.println(<span class="string">"很遗憾，您没有中奖！"</span>);</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="循环"><a href="#循环" class="headerlink" title="循环"></a>循环</h2><p>for<br>foreach：增强型for循环<br>while<br>do-while</p>
<h3 id="语法："><a href="#语法：" class="headerlink" title="语法："></a>语法：</h3><p>for:<br>for(初始化循环变量;循环条件;更新循环变量){<br> 循环体;<br>}</p>
<p>while:<br>初始化循环变量;<br>while(循环条件){<br> 循环体;<br> 更新循环变量;<br>}</p>
<p>do-while:<br>初始化循环变量;<br>do{<br> 循环体;<br> 更新循环变量;<br>}while(循环条件);</p>
<h3 id="while和do-while的区别"><a href="#while和do-while的区别" class="headerlink" title="while和do-while的区别"></a>while和do-while的区别</h3><p>while循环先判断，再执行。<br>do-while先执行，再判断。<br>while有可能一次都不执行。<br>do-while至少会执行一次。</p>
<h3 id="for循环和while（do-while）的区别："><a href="#for循环和while（do-while）的区别：" class="headerlink" title="for循环和while（do-while）的区别："></a>for循环和while（do-while）的区别：</h3><p>for适用于次数确定的循环<br>while，do-while适用于次数不确定的循环</p>
<h3 id="循环四要素："><a href="#循环四要素：" class="headerlink" title="循环四要素："></a>循环四要素：</h3><p>1.初始化循环变量；<br>2.循环条件；<br>3.迭代：更新循环变量；<br>4.循环体；</p>
<p>首先执行初始化循环变量，只执行一次。<br>判断循环条件是否成立，如果成立，执行循环体，<br>如果不成立，进行下一次循环，多次执行。<br>更新循环变量，多次执行。<br>循环体，多次执行</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test5</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>;i <= <span class="number">10000</span>;i++) {</span><br><span class="line"> System.out.println(i+<span class="string">":Hello World"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h2 id="🌰"><a href="#🌰" class="headerlink" title="🌰"></a>🌰</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 1.循环输入张三考试的五门成绩，分别打印输出，并且计算平均分。</span></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> Scanner scanner = <span class="keyword">new</span> Scanner(System.in);</span><br><span class="line"> <span class="keyword">float</span> score1 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score2 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score3 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score4 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score5 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>; i <= <span class="number">5</span>; i++) {</span><br><span class="line"> System.out.print(<span class="string">"请输入张三的第"</span>+i+<span class="string">"门成绩:"</span>);</span><br><span class="line"> <span class="keyword">switch</span>(i) {</span><br><span class="line"> <span class="keyword">case</span> <span class="number">1</span>:</span><br><span class="line"> score1 = scanner.nextFloat();</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">2</span>:</span><br><span class="line"> score2 = scanner.nextFloat();</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">3</span>:</span><br><span class="line"> score3 = scanner.nextFloat();</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">4</span>:</span><br><span class="line"> score4 = scanner.nextFloat();</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">5</span>:</span><br><span class="line"> score5 = scanner.nextFloat();</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> System.out.println(<span class="string">"张三的第1门成绩："</span>+score1);</span><br><span class="line"> System.out.println(<span class="string">"张三的第2门成绩："</span>+score2);</span><br><span class="line"> System.out.println(<span class="string">"张三的第3门成绩："</span>+score3);</span><br><span class="line"> System.out.println(<span class="string">"张三的第4门成绩："</span>+score4);</span><br><span class="line"> System.out.println(<span class="string">"张三的第5门成绩："</span>+score5);</span><br><span class="line"> System.out.println(<span class="string">"张三的平均成绩是"</span>+(score1+score2+score3+score4+score5)/<span class="number">5</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 2.任意输入一个整数：6</span></span><br><span class="line"><span class="comment">// 打印如下的加法表：</span></span><br><span class="line"><span class="comment">// 0 + 6 = 6</span></span><br><span class="line"><span class="comment">// 1 + 5 = 6</span></span><br><span class="line"><span class="comment">// 2 + 4 = 6</span></span><br><span class="line"><span class="comment">// 3 + 3 = 6</span></span><br><span class="line"><span class="comment">// 4 + 2 = 6</span></span><br><span class="line"><span class="comment">// 5 + 1 = 6</span></span><br><span class="line"><span class="comment">// 6 + 0 = 6</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test4</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> System.out.print(<span class="string">"请输入一个整数："</span>);</span><br><span class="line"> Scanner scanner = <span class="keyword">new</span> Scanner(System.in);</span><br><span class="line"> <span class="keyword">int</span> num = scanner.nextInt();</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>; i < num+<span class="number">1</span>; i++) {</span><br><span class="line"> System.out.println(i + <span class="string">"+"</span> + (num-i) + <span class="string">"="</span> + num);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 3.打印：如下图形</span></span><br><span class="line"><span class="comment">// *****</span></span><br><span class="line"><span class="comment">// *****</span></span><br><span class="line"><span class="comment">// *****</span></span><br><span class="line"><span class="comment">// *****</span></span><br><span class="line"><span class="comment">// *****</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test7</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < <span class="number">5</span>; j++) {</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span>; i < <span class="number">4</span> - j; i++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> System.out.println(<span class="string">"*****"</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 4.打印如下图形</span></span><br><span class="line"><span class="comment">// i 空格 *</span></span><br><span class="line"><span class="comment">// * 0 4 1 </span></span><br><span class="line"><span class="comment">// *** 1 3 3</span></span><br><span class="line"><span class="comment">// ***** 2 2 5</span></span><br><span class="line"><span class="comment">// ******* 3 1 7</span></span><br><span class="line"><span class="comment">// ********* 4 0 9</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test8</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span> ;i < <span class="number">5</span>; i++) {</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < <span class="number">4</span>-i; j++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出*</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> k = <span class="number">0</span>; k < <span class="number">2</span>*i+<span class="number">1</span>; k++) {</span><br><span class="line"> System.out.print(<span class="string">"*"</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < <span class="number">4</span>-i; j++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> System.out.println();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 5.打印如下图形</span></span><br><span class="line"><span class="comment">// * </span></span><br><span class="line"><span class="comment">// *** </span></span><br><span class="line"><span class="comment">// ***** </span></span><br><span class="line"><span class="comment">// ******* </span></span><br><span class="line"><span class="comment">// ********* </span></span><br><span class="line"><span class="comment">// ******* </span></span><br><span class="line"><span class="comment">// ***** </span></span><br><span class="line"><span class="comment">// *** </span></span><br><span class="line"><span class="comment">// *</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test9</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="comment">//上半部分</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span> ;i < <span class="number">5</span>; i++) {</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < <span class="number">4</span>-i; j++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出*</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> k = <span class="number">0</span>; k < <span class="number">2</span>*i+<span class="number">1</span>; k++) {</span><br><span class="line"> System.out.print(<span class="string">"*"</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < <span class="number">4</span>-i; j++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> System.out.println();</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//下半部分</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">0</span> ;i < <span class="number">4</span>; i++) {</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">0</span>; j < i+<span class="number">1</span>; j++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出*</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> k = <span class="number">0</span>; k < <span class="number">7</span>-<span class="number">2</span>*i; k++) {</span><br><span class="line"> System.out.print(<span class="string">"*"</span>);</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//输出空格</span></span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> m = <span class="number">0</span>; m < i+<span class="number">1</span>; m++) {</span><br><span class="line"> System.out.print(<span class="string">" "</span>);</span><br><span class="line"> }</span><br><span class="line"> System.out.println();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 6.输出9*9乘法口诀表</span></span><br><span class="line"><span class="comment">// 1*1 = 1</span></span><br><span class="line"><span class="comment">// 2*1 = 2 2*2 = 4</span></span><br><span class="line"><span class="comment">// 3*1 = 3 3*2 = 6 3*3 = 9</span></span><br><span class="line"><span class="comment">// ...</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test10</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>; i <= <span class="number">9</span>; i++) {</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j = <span class="number">1</span>; j <= i; j++) {</span><br><span class="line"> System.out.print(i+<span class="string">" * "</span>+j+<span class="string">" = "</span>+i*j+<span class="string">"\t"</span>);</span><br><span class="line"> }</span><br><span class="line"> System.out.println();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 7.循环输入张三考试的五门成绩，分别打印输出，并且计算平均分，如果操作不当，输入了负数，停止录入并提示错误。</span></span><br><span class="line"><span class="keyword">import</span> java.util.Scanner;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test11</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> Scanner scanner = <span class="keyword">new</span> Scanner(System.in);</span><br><span class="line"> <span class="keyword">float</span> score1 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score2 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score3 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score4 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="keyword">float</span> score5 = <span class="number">0.0f</span>;</span><br><span class="line"> <span class="comment">//用户是否输入了负数</span></span><br><span class="line"> <span class="keyword">boolean</span> flag = <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>; i <= <span class="number">5</span>; i++) {</span><br><span class="line"> System.out.print(<span class="string">"请输入张三的第"</span>+i+<span class="string">"门成绩:"</span>);</span><br><span class="line"> <span class="keyword">float</span> score = scanner.nextFloat();</span><br><span class="line"> <span class="comment">//如果输入的成绩<0，则跳出循环</span></span><br><span class="line"> <span class="keyword">if</span>(score < <span class="number">0</span>) {</span><br><span class="line"> flag = <span class="keyword">true</span>;</span><br><span class="line"> <span class="comment">// 当程序执行break时，直接停止当前循环，break之后的代码,不再执行;同时跳出整个循环体，不再执行后续的循环。</span></span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">switch</span>(i) {</span><br><span class="line"> <span class="keyword">case</span> <span class="number">1</span>:</span><br><span class="line"> score1 = score;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">2</span>:</span><br><span class="line"> score2 = score;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">3</span>:</span><br><span class="line"> score3 = score;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">4</span>:</span><br><span class="line"> score4 = score;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> <span class="keyword">case</span> <span class="number">5</span>:</span><br><span class="line"> score5 = score;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(flag) {</span><br><span class="line"> System.out.println(<span class="string">"您输入有误！请重新输入"</span>);</span><br><span class="line"> }<span class="keyword">else</span> {</span><br><span class="line"> System.out.println(<span class="string">"张三的第1门成绩："</span>+score1);</span><br><span class="line"> System.out.println(<span class="string">"张三的第2门成绩："</span>+score2);</span><br><span class="line"> System.out.println(<span class="string">"张三的第3门成绩："</span>+score3);</span><br><span class="line"> System.out.println(<span class="string">"张三的第4门成绩："</span>+score4);</span><br><span class="line"> System.out.println(<span class="string">"张三的第5门成绩："</span>+score5);</span><br><span class="line"> System.out.println(<span class="string">"张三的平均成绩是"</span>+(score1+score2+score3+score4+score5)/<span class="number">5</span>);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 8.计算1-10之间的整数之和，如果得到的累加值大于30，则停止循环，返回当前累加值。</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test12</span> </span>{</span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>{</span><br><span class="line"> <span class="keyword">int</span> sum = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i = <span class="number">1</span>; i <= <span class="number">10</span>; i++) {</span><br><span class="line"> sum += i;</span><br><span class="line"> <span class="keyword">if</span>(sum > <span class="number">30</span>) {</span><br><span class="line"> sum -= i;</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> System.out.println(sum);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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