moveboxss.java

200多个自己编的java程序,大家可以学一下.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class moveboxss extends Frame 
{
   private canvaspaint drawing=new canvaspaint();
   private class windowcloser extends WindowAdapter
   {
      public void WindowClosing(WindowEvent we)
      {  System.exit(0);  }
   }    
   public moveboxss()
   {
      super("move box");
      add(drawing);
      addWindowListener(new windowcloser());
      addKeyListener(new keyevents());
      setSize(400,400);
      show();
   }
 class canvaspaint extends Canvas
   {
    private int widths=30,heights=20,inc=4;
    private int x=80,y=80;
    public void paint(Graphics g)
     { 
     g.setColor(Color.red);
    g.fillRect(x,y,widths,heights);
    g.drawRect(0,0,getSize().width-1,getSize().height-1);
    }
     public void moveup()
     {  
       if(y>0)
        y-=inc;
       else
        y=getSize().height-inc;   
     } 
     public void movedown()
     { 
       if(y<(getSize().height-inc)) 
         y+=inc;
       else
         y=0;  
     } 
     public void moveright()
     { 
       if(x<(getSize().width-inc))
         x+=inc;
        else
          x=0;
     } 
     public void moveleft()
     { 
       if(x>0)
         x-=inc;
       else
         x=getSize().width-inc;
      }
    }

   private class keyevents extends KeyAdapter
  {
  canvaspaint drawing=new canvaspaint();
  public void keyPressed(KeyEvent ke)
  {
     if(ke.getKeyCode()==KeyEvent.VK_W)
       drawing.moveup();
     else if(ke.getKeyCode()==KeyEvent.VK_D)
       drawing.movedown();
     else if(ke.getKeyCode()==KeyEvent.VK_A)
       drawing.moveright();
     else if(ke.getKeyCode()==KeyEvent.VK_S)
       drawing.moveleft();
       drawing.repaint();
   }
   
  
  }
  public static void main(String args[])
  {
     moveboxss box=new moveboxss();
  }
}