窗口监视

import java.awt.Color;
import java.awt.event.*;

import javax.swing.*;
public class My implements ActionListener{
	JFrame f;
	JButton b;
	JPanel p;

   public  My(){
	f=new JFrame();	
	p=new JPanel();
	b=new JButton("点击");
	b.addActionListener(this);
	f.add(p);
	p.add(b);
	f.setSize(400,300);
	f.setVisible(true);
}
  

public static void main(String[]args){
	new My();
	}


@Override
public void actionPerformed(ActionEvent e) {
	p.setBackground(Color.pink);
	
	
	   
	}
	      }