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<h1>Java面向对象思维之构造方法</h1>
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<div id="post" class="sdq-post-Statistics">
<a>2020年11月28日</a>
<a class="post-count">99 字</a>
<a class=" -link" href="/categories/Java/">Java</a>
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<strong class="sidebar-title">目录</strong>
<ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#%E4%BE%8B%E5%A6%82%E9%80%A0%E4%B8%80%E8%BE%86%E8%BD%A6-%E8%80%8C%E8%BD%A6%E6%9C%89%E4%BB%80%E4%B9%88%E5%B1%9E%E6%80%A7%EF%BC%9F-%E4%BE%8B%E5%A6%82-%E8%BD%A6%E6%9C%89%E9%A2%9C%E8%89%B2-%E8%BD%A6%E6%9C%89%E8%BD%AE%E5%AD%90-%E8%BD%A6%E5%BA%A7%E4%BD%8D"><span class="toc-text">例如造一辆车 而车有什么属性？ 例如 车有颜色 车有轮子 车座位</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E5%8A%A8%E4%BD%9C"><span class="toc-text">动作</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E6%89%A7%E8%A1%8Cmain%E6%96%B9%E6%B3%95"><span class="toc-text">执行main方法</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#%E6%9E%84%E9%80%A0%E6%96%B9%E6%B3%95%E9%9C%80%E8%A6%81%E6%B3%A8%E6%84%8F"><span class="toc-text">构造方法需要注意</span></a></li></ol>
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<p><strong>学习Java个人整理</strong></p>
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<h1 id="例如造一辆车-而车有什么属性？-例如-车有颜色-车有轮子-车座位"><a href="#例如造一辆车-而车有什么属性？-例如-车有颜色-车有轮子-车座位" class="headerlink" title="例如造一辆车 而车有什么属性？ 例如 车有颜色 车有轮子 车座位"></a>例如造一辆车 而车有什么属性？ 例如 车有颜色 车有轮子 车座位</h1><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></pre></td><td class="code"><pre><code class="hljs Java"> <span class="hljs-comment">//成员变量</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">Car</span> {<br>String color; <span class="hljs-comment">//颜色</span><br><span class="hljs-type">int</span> wheel; <span class="hljs-comment">//轮子</span><br><span class="hljs-type">int</span> seat; <span class="hljs-comment">//座位</span><br>}<br></code></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></pre></td><td class="code"><pre><code class="hljs Java">自动生成一个无参数的构造方法 <span class="hljs-keyword">public</span> <span class="hljs-title function_">Car</span><span class="hljs-params">()</span> { <br><span class="hljs-keyword">public</span> <span class="hljs-title function_">Car</span><span class="hljs-params">(String color, <span class="hljs-type">int</span> wheel, <span class="hljs-type">int</span> seat)</span> { <span class="hljs-comment">//这里给它添加参数 </span><br> 设置属性信息<br> <span class="hljs-built_in">this</span>.color = color; 颜色<br> <span class="hljs-built_in">this</span>.wheel = wheel; 轮子<br> <span class="hljs-built_in">this</span>.seat = seat; 座位<br>}<br></code></pre></td></tr></table></figure>
<h1 id="动作"><a href="#动作" class="headerlink" title="动作"></a>动作</h1><p><strong>例如 车能飞</strong></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></pre></td><td class="code"><pre><code class="hljs Java"> <span class="hljs-comment">//成员方法</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">fly</span>(){<br>System.out.println(<span class="hljs-built_in">this</span>.color+<span class="hljs-string">"车能飞"</span>);<br>}<br></code></pre></td></tr></table></figure>
<p><strong>例如 车可以潜水</strong></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></pre></td><td class="code"><pre><code class="hljs Java"> <span class="hljs-comment">//成员方法</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">diving</span>(){<br>System.out.println(<span class="hljs-built_in">this</span>.diving+<span class="hljs-string">"车可以下水"</span>);<br>}<br></code></pre></td></tr></table></figure>
<h1 id="执行main方法"><a href="#执行main方法" class="headerlink" title="执行main方法"></a>执行main方法</h1><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></pre></td><td class="code"><pre><code class="hljs Java"> <span class="hljs-comment">//成员方法</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title function_">main</span><span class="hljs-params">(String[ ] args)</span> {<br> <span class="hljs-type">Car</span> <span class="hljs-variable">c1</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Car</span>(<span class="hljs-string">"透明"</span>,<span class="hljs-number">5</span>,<span class="hljs-number">9</span>);<br> <span class="hljs-type">Car</span> <span class="hljs-variable">c2</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Car</span>(<span class="hljs-string">"黄"</span>,<span class="hljs-number">5</span>,<span class="hljs-number">9</span>);<br> c1.fly();<br> c1.diving();<br><br> c2.fly();<br> c2.diving();<br> }<br>}<br></code></pre></td></tr></table></figure>
<h1 id="构造方法需要注意"><a href="#构造方法需要注意" class="headerlink" title="构造方法需要注意"></a>构造方法需要注意</h1><p><strong>没有返回值这一项</strong></p>
<p><strong>在new的时候, 给对象设置属性信息</strong></p>
<p><strong>Java会默认自动的送每个类一个无参数的构造方法, 如果你写了构造方法, 那么Java就不送了</strong></p>
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<strong>本文作者：</strong>
史迪奇<br>
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