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<td height="20" align="center"><font color="#FFFFFF">==<b>開發教室==</b></font></td>
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<p><span class="title">Java Applet 入門</span></p>
<p align="right"><a href="mailto:yy435@263.net">yy435</a></p>
<p align="right">太平洋網絡學院</p>
<p align="center" class="green">第四天</p>
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<p align="left" class="green">鍵盤事件例子</p>
<p>這個例子需要你先用鼠標在JavaApplet區域中點一下，然后就可以在鍵盤上面按鍵了，你的每一次按的什么鍵，都可以在屏幕上面顯示出來，沒有騙你，試試看吧！</p>
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<td><applet code="KeyStrike.class" width="400" height="100">
</applet></td>
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<p>這個例子的源代碼如下：</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; //定義初始的輸出位置
public boolean keyDown(Event e, int key)//鍵盤處理方法
{
switch(key) //確定按下的鍵值
{
case Event.UP:Outy--;break; //如果按下的是向上鍵則……
case Event.DOWN:Outy++;break; //如果按下的是向下鍵則……
case Event.LEFT:Outx--;break; //如果按下的是向左鍵則……
case Event.RIGHT :Outx++;break; //如果按下的是向右鍵則……
case Event.HOME :Outx=5;Outy=15;break;//如果按下的是向Home鍵則
case Event.END :Outx=5;Outy=size().height -15;break;
/如果按下的是End鍵則……
case Event.PGUP :Outy-=5;break; //如果按下的是PageUp鍵則……
case Event.PGDN :Outy+=15;break; //如果按下的是Page Down鍵則
default:PressKey=(char)key;break; //如果按下的不是以上鍵則……
}
repaint();
return true;
}
public void paint(Graphics g)
{
if(PressKey!=0)
g.drawString ("你按下了： "+PressKey+" 鍵",Outx,Outy);
//顯示按鍵信息！
}
}
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