example18_7.java

不错的教程 适合中高级人员的使用

import java.applet.*;import java.awt.*;
import java.awt.event.*;
public class Example18_7 extends Applet implements
KeyListener
{  Button b[]=new Button[10];
   int x,y;
   public void init()
   {  for(int i=0;i<=9;i++) 
         {  b[i]=new Button(""+i);
            b[i].addKeyListener(this);
            add(b[i]);
         }
   }
   public void keyPressed(KeyEvent e)
   {  Button button=(Button)e.getSource();
      x=button.getBounds().x;
      y=button.getBounds().y;
      if(e.getKeyCode()==KeyEvent.VK_UP)
        {  y=y-2;
           if(y<=0) y=0;
           button.setLocation(x,y);
        }
      else if(e.getKeyCode()==KeyEvent.VK_DOWN)
       {  y=y+2;
          if(y>=300) y=300; 
          button.setLocation(x,y);
       }
      else if(e.getKeyCode()==KeyEvent.VK_LEFT)
       {  x=x-2;
          if(x<=0) x=0;
          button.setLocation(x,y);
       } 
      else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
       {  x=x+2;
          if(x>=300) x=300;
          button.setLocation(x,y);
       }
   }
   public void keyTyped(KeyEvent e) {}
   public void keyReleased(KeyEvent e) {}
}