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itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="菠菜眾長"></span><header class="post-header"><h2 class="post-title" itemprop="name headline">Java父类子类的对象初始化过程<a href="https://github.com/Lruihao/lruihao.github.io/tree/hexo/source/_posts/substatus.md" class="post-edit-link" title="编辑" rel="external nofollow noopener noreferrer" target="_blank"><i class="fa fa-pencil"></i></a></h2><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2019-03-21 13:36:25" itemprop="dateCreated datePublished" datetime="2019-03-21T13:36:25+08:00">2019-03-21</time> </span><span class="post-category"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-folder-o"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Backend/" itemprop="url" rel="index"><span itemprop="name">Backend</span></a></span> ， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Backend/JAVA/" itemprop="url" rel="index"><span itemprop="name">JAVA</span></a></span> </span><span class="post-comments-count"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-comment-o"></i> </span><span class="post-meta-item-text">评论数： </span><a href="/posts/substatus.html#comments" itemprop="discussionUrl"><span class="post-comments-count valine-comment-count" data-xid="/posts/substatus.html" itemprop="commentCount"></span> </a></span><span id="/posts/substatus.html" class="leancloud_visitors" data-flag-title="Java父类子类的对象初始化过程"><span class="post-meta-divider">|</span> <span title="阅读次数"><span class="post-meta-item-icon"><i class="fa fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span></span></span><div class="post-symbolscount"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-file-word-o"></i> </span><span class="post-meta-item-text">本文字数：</span> <span title="本文字数">317</span> <span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-clock-o"></i> </span><span class="post-meta-item-text">阅读时长 ≈</span> <span title="阅读时长">1 分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><blockquote><p>摘要: Java基本的对象初始化过程，子类的初始化，以及涉及到父类和子类的转化时可能引起混乱的情况。</p></blockquote><a id="more"></a><h1 id="基本初始化过程"><a href="#基本初始化过程" class="headerlink" title="基本初始化过程"></a>基本初始化过程</h1><p>对于一个简单类的初始化过程是：<br><code>static 修饰的模块（static变量和static 块） => 按照代码顺序依次执行。</code><br>↓<br><code>实例变量 及非static模块 => 按照代码顺序依次执行。</code><br>↓<br><code>构造函数 => 执行对应的构造函数。</code></p><h1 id="子类的初始化过程"><a href="#子类的初始化过程" class="headerlink" title="子类的初始化过程"></a>子类的初始化过程</h1><p><code>父类static修饰的模块</code><br>↓<br><code>子类static修饰模块</code><br>↓<br><code>父类实例变量和非static块</code><br>↓<br><code>父类对应构造函数。当子类对应构造函数中没有显示调用时调用的是父类默认的构造函数。</code><br>↓<br><code>子类实例变量和非static块</code><br>↓<br><code>子类构造函数</code></p><figure class="highlight java"><figcaption><span>Debug demo</span></figcaption><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> code0507;</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">Demo</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><br><span class="line"> Sub sub = <span class="keyword">new</span> Sub();</span><br><span class="line"> System.out.println(sub);</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Super</span> </span>{</span><br><span class="line"> <span class="keyword">int</span> a = <span class="number">6</span>;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Super</span><span class="params">()</span> </span>{</span><br><span class="line"> test(); <span class="comment">//被子类同名函数覆盖，优先访问子类test</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">int</span> b=<span class="number">9</span>;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(a);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Sub</span> <span class="keyword">extends</span> <span class="title">Super</span> </span>{</span><br><span class="line"> <span class="keyword">int</span> a = <span class="number">8</span>;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">Sub</span><span class="params">()</span> </span>{</span><br><span class="line"> test();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span> </span>{</span><br><span class="line"> System.out.println(a);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><p>运行结果<br></p><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">0</span><br><span class="line">8</span><br></pre></td></tr></table></figure><p></p></div><div class="popular-posts-header"><i class="fa fa-link"></i> 相关文章</div><!--[if !IE]><!--><details><summary style="cursor:pointer">点击查看</summary><!--<![endif]--><ul class="popular-posts"><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\stringbuffer.html" rel="bookmark">java常用类</a></div></li><li class="popular-posts-item"><div class="popular-posts-title"><a href="\posts\biaoshi.html" 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searchResultList += "</ul>";
resultContent.innerHTML = searchResultList;
}
}
if ('auto' === 'auto') {
input.addEventListener('input', inputEventFunction);
} else {
$('.search-icon').click(inputEventFunction);
input.addEventListener('keypress', function (event) {
if (event.keyCode === 13) {
inputEventFunction();
}
});
}
// remove loading animation
$(".local-search-pop-overlay").remove();
$('body').css('overflow', '');
proceedsearch();
}
});
}
// handle and trigger popup window;
$('.popup-trigger').click(function(e) {
e.stopPropagation();
if (isfetched === false) {
searchFunc(path, 'local-search-input', 'local-search-result');
} else {
proceedsearch();
};
});
$('.popup-btn-close').click(onPopupClose);
$('.popup').click(function(e){
e.stopPropagation();
});
$(document).on('keyup', function (event) {
var shouldDismissSearchPopup = event.which === 27 &&
$('.search-popup').is(':visible');
if (shouldDismissSearchPopup) {
onPopupClose();
}
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