CardLayout show a specific card with button click

I'm having trouble with the CardLayout to have a particular card to be displayed when a button is clicked.

My code is posted below and I am sure that the issue is with the ".show" part but I am not sure what is exactly wrong with it as I am a complete novice with Java and Java Swing so I am pretty much learning as I go!

Code :

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class CardLayoutTest {
 
    public static void main(String[] args) {
 
        final String card1Text = "Card 1";
        final String card2Text = "Card 2";
        final String card3Text = "Card 3";
        final JPanel cards; //a panel that uses CardLayout
        // button commands
        final String ONE = "ONE";
        final String TWO = "TWO";
        final String THREE = "THREE";
 
 
        JFrame frame = new JFrame("CardLayout Test");
 
 
        //Create the "cards".
        JPanel card1 = new JPanel();
        card1.setBackground(Color.RED);
 
        JPanel card2 = new JPanel();
        card2.setBackground(Color.GREEN);
 
        JPanel card3 = new JPanel();
        card3.setBackground(Color.BLUE);
 
        //Create the panel that contains the "cards".
        cards = new JPanel(new CardLayout());
        cards.add(card1, card1Text);
        cards.add(card2, card2Text);
        cards.add(card3, card3Text);
 
 
        class ControlActionListenter implements ActionListener {
            public void actionPerformed(ActionEvent e) {
                CardLayout cl = (CardLayout) (cards.getLayout());
                String cmd = e.getActionCommand();
                if (cmd.equals(ONE)) {
                    cl.show(cards, ONE);
                } else if (cmd.equals(TWO)) {
                    cl.show(cards, TWO);
                } else if (cmd.equals(THREE)) {
                    cl.show(cards, THREE);
                }
            }
        }
        ControlActionListenter cal = new ControlActionListenter();
 
        JButton btn1 = new JButton("ONE");
        btn1.setActionCommand(ONE);
        btn1.addActionListener(cal);
 
        JButton btn2 = new JButton("TWO");
        btn2.setActionCommand(TWO);
        btn2.addActionListener(cal);
 
        JButton btn3 = new JButton("THREE");
        btn3.setActionCommand(THREE);
        btn3.addActionListener(cal);
 
        JPanel controlButtons = new JPanel();
        controlButtons.add(btn1);
        controlButtons.add(btn2);
        controlButtons.add(btn3);
 
 
        Container pane = frame.getContentPane();
        pane.add(cards, BorderLayout.CENTER);
        pane.add(controlButtons, BorderLayout.PAGE_END);
 
 
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}

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Pass the same argument name to the show method as you did to the add method.

Thanks for your help!

It works as intended now!