example18_13.java#backup

用JAVA语言编写的玩积木程序

import java.applet.*;import java.awt.*;import java.awt.event.*;
public class Example18_13 extends Applet implements KeyListener,ActionListener
{Label label=new Label("点击一个积木，然后移动它");
 Button b[]=new Button[40];
 int x[]=new int[40];
 int y[]=new int[40];
 String s=null;
 public void init()
 { setLayout(null);
   add(label);
   label.setBounds(0,0,150,30); 
  int k1=70,k2=70,k3=70,k4=70;
  for(int i=0;i<40;i++)
  {b[i]=new Button(String.valueOf(i));
   if(i%3==0) b[i].setBackground(Color.red);
   if(i%3==1) b[i].setBackground(Color.blue);
   if(i%3==2) b[i].setBackground(Color.yellow);
   b[i].addKeyListener(this);//按钮获得键盘事件监视器.
   b[i].addActionListener(this); add(b[i]);
   if(i%4==0)         {b[i].setBounds(k1,40,30,30);k1=k1+31;}
   else if(i%4==1)  {b[i].setBounds(k2,71,30,30);k2=k2+31;}
   else if(i%4==2)  {b[i].setBounds(k3,102,30,30);k3=k3+31;}
   else if(i%4==3)  {b[i].setBounds(k4,133,30,30);k4=k4+31;}
  }
  for(int i=0;i<40;i++)
  { x[i]=b[i].getBounds().x;y[i]=b[i].getBounds().y;//获取按钮左上角的x,y坐标。
  }
 }
 public void keyTyped(KeyEvent e)
 { } 
 public void keyPressed(KeyEvent e)
 {if(e.getKeyCode()==KeyEvent.VK_UP)
    {for(int i=0;i<=39;i++)
      { if(s.equals(String.valueOf(i)))
        {y[i]=y[i]-2;
         if(y[i]<=0) y[i]=0;
         b[i].setLocation(x[i],y[i]);
        }
      }
    }
 else if(e.getKeyCode()==KeyEvent.VK_DOWN)
    {for(int i=0;i<=39;i++)
      {if(s.equals(String.valueOf(i)))
        {y[i]=y[i]+2;
        if(y[i]>=300) y[i]=300;
        b[i].setLocation(x[i],y[i]); 
        }
      }
    }
 else if(e.getKeyCode()==KeyEvent.VK_LEFT)
    {for(int i=0;i<=39;i++)
      {if(s.equals(String.valueOf(i)))
       {x[i]=x[i]-2;
        if(x[i]<=0) x[i]=0;
        b[i].setLocation(x[i],y[i]);
       }
      }
    } 
 else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
    {for(int i=0;i<=39;i++)
      {if(s.equals(String.valueOf(i)))
       {x[i]=x[i]+2;
        if(x[i]>=300) x[i]=300;
        b[i].setLocation(x[i],y[i]);
       }
      }
    }
  
 }
 public void keyReleased(KeyEvent e)
 {}
 public void actionPerformed(ActionEvent e)
 { for(int i=0;i<40;i++)
   {if(e.getSource()==b[i])
     s=b[i].getLabel();
   }
 }
}