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What is the CardLayout

Place components like a deck of cards. Only the "top" component is visible at any one time. import java.awt.CardLayout; import java.awt.Color; import java.awt.Container; import javax.swing.JFrame; import javax.swing.JPanel; public class CardLayoutBehaviour extends JFrame {   protected CardLayout layout;   public static void main(String[] args) {     CardLayoutBehaviour ct = new CardLayoutBehaviour();     ct.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     ct.displayTab("Green Tab");     ct.setSize(400, 300);     ct.setVisible(true);   }   public CardLayoutBehaviour() {     JPanel tab;     Container pane = getContentPane();     layout = new CardLayout();     pane.setLayout(layout);     tab = new JPanel();     tab.setBackground(Color.red);     pane.add(tab, "Red Tab");     tab = new JPanel();     tab.setBackground(Color.green);     pane.add(tab, "Green Tab");     tab = new JPanel();     tab.setBackground(Color.blue);     pane.add(tab, "Blue Tab");   }   public void displayTab(String name) {     layout.show(this.getContentPane(), name);   } }