Java CardLayout .addLayoutComponent (Component comp, Object constraints)

public void addLayoutComponent(Component comp,   Object constraints)

//from w  ww.j  a  v  a 2 s . co m
import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {

  public static void main(String[] args) {
    JFrame aWindow = new JFrame();
    aWindow.setSize(400, 400);
    aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    aWindow.add(new CardLayoutPanel());
    aWindow.setVisible(true);
  }
}

class CardLayoutPanel extends JPanel implements ActionListener {
  CardLayout card = new CardLayout(50, 50);

  public CardLayoutPanel() {
    setLayout(card);
    JButton button = new JButton("Press 1");
    button.addActionListener(this);
    card.addLayoutComponent(button, "1");
    add(button);    
    
    button = new JButton("Press 2");
    button.addActionListener(this);
    card.addLayoutComponent(button, "2");
    add(button);
    
    button = new JButton("Press 3");
    button.addActionListener(this);
    card.addLayoutComponent(button, "3");
    add(button);

    card.show(this, "2");
  }
  public void actionPerformed(ActionEvent e) {
    card.next(this);
  }
}