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<td height="20" align="center"><font color="#FFFFFF">==<b>开发教室==</b></font></td>
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<p><span class="title">Java Applet 入门</span></p>
<p align="right"><a href="mailto:yy435@263.net">yy435</a></p>
<p align="right">太平洋网络学院</p>
<p align="center" class="green">第四天</p>
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<p align="left" class="green">键盘事件例子</p>
<p>这个例子需要你先用鼠标在JavaApplet区域中点一下，然后就可以在键盘上面按键了，你的每一次按的什么键，都可以在屏幕上面显示出来，没有骗你，试试看吧！</p>
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<td><applet code="KeyStrike.class" width="400" height="100">
</applet></td>
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<p>这个例子的源代码如下：</p>
<pre>import java.awt.Event ;
import java.awt.Graphics ;
import java.applet.*;
public class KeyStrike extends Applet
{
char PressKey=0;
int Outx=5,Outy=15; //定义初始的输出位置
public boolean keyDown(Event e, int key)//键盘处理方法
{
switch(key) //确定按下的键值
{
case Event.UP:Outy--;break; //如果按下的是向上键则……
case Event.DOWN:Outy++;break; //如果按下的是向下键则……
case Event.LEFT:Outx--;break; //如果按下的是向左键则……
case Event.RIGHT :Outx++;break; //如果按下的是向右键则……
case Event.HOME :Outx=5;Outy=15;break;//如果按下的是向Home键则
case Event.END :Outx=5;Outy=size().height -15;break;
/如果按下的是End键则……
case Event.PGUP :Outy-=5;break; //如果按下的是PageUp键则……
case Event.PGDN :Outy+=15;break; //如果按下的是Page Down键则
default:PressKey=(char)key;break; //如果按下的不是以上键则……
}
repaint();
return true;
}
public void paint(Graphics g)
{
if(PressKey!=0)
g.drawString ("你按下了： "+PressKey+" 键",Outx,Outy);
//显示按键信息！
}
}
</PRE>
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