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<div align="center" class="title">JAVA程序員必讀：基礎篇（2）面向對象編程概念</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網絡學院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
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<p class="article"></p>
<p></p>
<p><b><span class="article">2.7.5 ClickMe Applet中的繼承</span></b></p>
<p class="article">為了在瀏覽器種運行，對象必須是一個applet。這就意味著對象必須是類的一個實例，這個類是從由JAVA平臺提供的Applet類派生而來的。</p>
<p class="article">ClickMe applet對象是一個ClickMe類的一個實例，它是這樣聲明的： </p>
<p class="article">public class ClickMe extends Applet implements
MouseListener {</p>
<p class="article"> ...</p>
<p class="article">}</p>
<p class="article"> 上面的語句就產生了Applet的一個子類。ClickMe繼承了父類的許多功能，包括初始化、由瀏覽器來開始和結束、在瀏覽器區域畫圖以及對接收到的鼠標事件注冊。除了有了這些功能，ClickMe類還要實現以下的功能：它的畫圖代碼在paint的方法中，初始化代碼必須在init方法中等等。
</p>
<p class="article">public void init() {</p>
<p class="article"> ... // 這里加入ClickMe的初始化代碼</p>
<p class="article">}</p>
<p></p>
<p class="article">public void paint(Graphics g) {</p>
<p class="article"> ... // 這里加入ClickMe的畫圖代碼</p>
<p class="article">}</p>
<p class="article"></p>
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