import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
 
public class addremove extends JPanel implements ActionListener{
    private JButton addbut;
    private JButton revbut;
    private JPanel panel1;
    private JPanel panel2;
 
    public addremove() {
 
        addbut = new JButton ("Add");
        revbut = new JButton ("Remove");
        panel1 = new JPanel();
		panel2 = new JPanel();
 
		panel1.setBackground(Color.blue);
		panel2.setBackground(Color.red);
 
        setPreferredSize (new Dimension (218, 160));
        setLayout (null);
 
 
        add (addbut);
        add (revbut);
        add (panel2);
 
 
        addbut.setBounds (20, 120, 80, 25);
        revbut.setBounds (120, 120, 80, 25);
        panel1.setBounds (20,10,180,60);
        panel2.setBounds (20,10,180,60);
    }
 
    public void actionPerformed(ActionEvent e)
    {
		if(e.getSource() == addbut)
		{
			remove(panel2);
 
			add(panel1);
 
		}
		else if (e.getSource() == revbut)
		{
			remove(panel1);
 
			add(panel2);
 
		}
	}
 
 
 
 
 
    public static void main (String[] args) {
        JFrame frame = new JFrame ("addremove");
        frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add (new addremove());
        frame.pack();
        frame.setVisible (true);
        frame.setLocation(450,280);
        frame.setResizable(false);
    }
}