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2018-11-02-类的继承小结.html
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<ul>
<li><strong>被继承的类称为**</strong>超类（父类）<strong><strong>。从超类派生出来（继承超类）的新类称</strong></strong>子类。**</li>
<li><strong>只支持单重继承，不支持多重继承，所以一个类只能有一个超类。</strong></li>
<li><strong>继承的层次结构。一个子类成为另一个子类的超类。</strong></li>
<li><strong>如果类**</strong>Sub<strong><strong>是类</strong></strong>Super<strong><strong>的子类，则类</strong></strong>Sub<strong><strong>继承了超类</strong></strong>Super<strong>**的变量和方法。</strong></li>
<li><strong>子类**</strong>Sub<strong><strong>中，包括两部分的内容：从超类</strong></strong>Super<strong>**中继承下来的变量和方法，自己新增加的变量和方法。</strong></li>
</ul>
<h2 id="子类继承超类的成员变量和方法"><a href="#子类继承超类的成员变量和方法" class="headerlink" title="子类继承超类的成员变量和方法"></a><strong>子类继承超类的成员变量和方法</strong></h2><h3 id="继承原则"><a href="#继承原则" class="headerlink" title="继承原则"></a><strong>继承原则</strong></h3><p><strong>子类只继承超类中非**</strong>private<strong>**的成员变量和方法。</strong> 用访问器方法访问类的私有成员：例：</p>
<pre><code>double getWidth(){return width;}
double getHeight(){return height;}
void setWidth(double w){ width=w;}
void setHeight(double h){ height=h;}
</code></pre><h3 id="什么时候应该把实例变量声明为private？"><a href="#什么时候应该把实例变量声明为private？" class="headerlink" title="什么时候应该把实例变量声明为private？"></a>什么时候应该把实例变量声明为private？</h3><p>一般坚持两个基本原则：如果一个实例变量只被它所在类中的方法使用，那么应该将其声明为private。如果一个实例变量必须应用在某一个范围内，那么就应该将其声明为private，而且只能通过访问器方法来访问它。这样可以防止把无效的值附给它。</p>
<h3 id="变量的-隐藏原则"><a href="#变量的-隐藏原则" class="headerlink" title="变量的**隐藏原则**"></a><strong>变量的**</strong>隐藏原则**</h3><p><strong>子类的成员变量和超类的成员变量同名时，超类的成员变量被隐藏（不能继承）。</strong></p>
<h3 id="方法的-覆盖原则"><a href="#方法的-覆盖原则" class="headerlink" title="方法的**覆盖原则**"></a><strong>方法的**</strong>覆盖原则**</h3><p><strong>子类的成员方法和超类的成员方法同名时，超类的成员方法被子类的成员方法覆盖（不能继承）。</strong></p>
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