Practical 4: Write a program to create a two-level card deck that allows the user to select component of Panel using CardLayout

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.JFrame; 
import javax.swing.*; 
  
public class CardLayoutDemo extends JFrame implements ActionListener { 
  
    CardLayout card; 
    JButton b1, b2, b3;   
    Container c; 
  
    CardLayoutDemo() 
    { 
        c = getContentPane(); 
        card = new CardLayout(40, 30); 
        c.setLayout(card); 
  
        b1 = new JButton("First Level"); 
        b2 = new JButton("Second Level"); 
  
        b1.addActionListener(this); 
        b2.addActionListener(this); 
  
        c.add("a", b1); 
        c.add("b", b2); 
    } 
      
    public void actionPerformed(ActionEvent e) 
    { 
        card.next(c); 
    } 

    public static void main(String[] args) 
    { 
        CardLayoutDemo cl = new CardLayoutDemo(); 
  
        cl.setSize(400, 400);
        cl.setVisible(true); 
        cl.setDefaultCloseOperation(EXIT_ON_CLOSE); 
    } 
} 

Output:

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