升旗（驱动事件）

package v;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.awt.Image.*;

public class shen extends JFrame{

 

         public shen()

         {

                   add(new moving());

                   //add(new moving());

         }

         public static void main(String[] args) {

                   // TODO Auto-generated method stub

                   shen frame=new shen();

                   frame.setTitle("sheng qi");

                   frame.setSize(800,700);

                   frame.setLocationRelativeTo(null);

                   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                   frame.setVisible(true);

 

         }

         static class moving extends JPanel{

                   Image image=new ImageIcon("2.gif").getImage();

                   int x=300;

                   int y=700;

                   public moving(){

                           

                            Timer timer=new Timer(100,new TimerListener());

                            timer.start();

                   }

                   protected void paintComponent(Graphics g){

                           

                            super.paintComponent(g);

                           

                            if(y<0){

                                     y=y+getHeight();

                            }else

                             y=y-10;

                            g.drawImage(image, x,y,100,60,this);

                   }

        

         class TimerListener implements ActionListener{

                   public void actionPerformed(ActionEvent e){

                           

                            repaint();

                   }

         }

         }

}