AdapterDemo

适配器类：实现了带有无任何内容方法的监听器接口。

适配器类的主要思想：使你可以从已经提供的适配器类中派生出自己的监听器类，仅实现自己感兴趣的方法。

package eventhandle;
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
public class AdapterDemo extends Applet{
public void init()
{
   addMouseListener(new MyMouseAdapter(this));
   addMouseMotionListener(new MyMouseMotionAdapter(this));
}
class MyMouseAdapter extends MouseAdapter
{
   private AdapterDemo adapterdemo;
   public MyMouseAdapter(AdapterDemo adapterdemo)
   {
    this.adapterdemo=adapterdemo;
   }
   public void mouseClicked(MouseEvent m)
   {
    adapterdemo.showStatus("mouse clicked");
   }
}
class MyMouseMotionAdapter extends MouseAdapter
{
   private AdapterDemo adapterdemo;
   public MyMouseMotionAdapter(AdapterDemo adapterdemo)
   {
    this.adapterdemo=adapterdemo;
   }
   public void mouseDragged(MouseEvent m)
   {
    adapterdemo.showStatus("mouseDragged");
   }
}
}