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<title>csdn_动画程序的设计原理</title>
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<td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap> 动画程序的设计原理 </td>
<p> <td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap>作者：Al Saganich </p>
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<p><b>动画程序的设计原理</b></p>
<p>既然我们已经看过动画是如何开始的。现在看看它的机理。首先，我们通过定义Runnable 接口的方式来编写小程序，一旦定义了该接口，就表明我们将在其后实现run方法。</p>
<pre><font face="Courier New, Courier, mono" size="2">public class TstRunnable
extends Applet implements Runnable . . </font></pre>
<p>然后我们编写run方法，该方法将被动画线程所调用。</p>
<pre><font face="Courier New, Courier, mono">public void run() {
</font><font face="Courier New, Courier, mono">. . .
</font><font face="Courier New, Courier, mono"> }</font></pre>
<p>我们也需要一个线程对象，该对象将管理我们的动画线程，如：</p>
<pre><font face="Courier New, Courier, mono" size="2">private Thread m_Thread = null;</font></pre>
<p>一旦做好这些准备工作以后，当applet第一次被显示时，就会创建线程对象的一个实例，并把this对象作为建构方法的参数，之后就可以启动动画了：</p>
<pre><font face="Courier New, Courier, mono">public void start() {
</font><font face="Courier New, Courier, mono"> if (m_Thread == null) {
</font><font face="Courier New, Courier, mono"> m_Thread = new Thread(this);
</font><font face="Courier New, Courier, mono"> m_Thread.start();
</font><font face="Courier New, Courier, mono"> }
</font><font face="Courier New, Courier, mono">}</font></pre>
<p>最后一步编写如下代码：一旦applet 被隐藏时，就停止动画，Applet的stop方法如下：</p>
<pre><font face="Courier New, Courier, mono">public void stop(){
</font><font face="Courier New, Courier, mono"> if (m_Thread != null) {
</font><font face="Courier New, Courier, mono"> m_Thread.stop();
</font><font face="Courier New, Courier, mono"> m_Thread = null;
</font><font face="Courier New, Courier, mono"> }
</font><font face="Courier New, Courier, mono">}</font></pre>
<pre><b>结论</b></pre>
<p>基于线程的程序功能强大。本文中，我们讨论了线程的一些基本知识：什么是线程，如何使用它们。下个月，我们将学习一些使用线程时的注意点，并讨论线程的一些高级用法。</p>
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