16.16

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Test_16_16 extends JFrame{

public Test_16_16(){
add(new JP());
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Test_16_16 frame = new Test_16_16();
frame.setSize(300,220);
frame.setTitle("Test_16_16");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null); // Center the frame
frame.setVisible(true);
}

static class JP extends JPanel{
private boolean visi = true;

public JP(){
Timer timer = new Timer(1000,new TimerListener());
timer.start();
}
protected void paintComponent(Graphics g){
super.paintComponent(g);
if(visi == true)
g.drawImage(new ImageIcon("image/flag4.gif").getImage(), 0, 0, this);
}
class TimerListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(visi == true) visi = false;
else visi = true;
repaint();
}

}
}
}