import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class MySwing extends JFrame
{
Random rand;
Color randomColor;
MySwing()
{
super("Change Color");
setLayout(new FlowLayout());

setSize(500,500);
setVisible(true);
addWindowListener(new MyClose());
setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
}
class MyClose extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
rand = new Random();
float r = rand.nextFloat();
float g = rand.nextFloat();
float b = rand.nextFloat();
randomColor = new Color(r, g, b);
repaint();
}
}

public void paint(Graphics g)
{
getContentPane().setBackground(randomColor);
}
}

class Slip14
{
public static void main(String[] args) {
MySwing obj= new MySwing();
}
}