cardlayoutdemo.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

import java.awt.*;
import java.applet.Applet;

public class CardLayoutDemo extends Applet
{
  public void init()
  {
    p1=new Panel();
    p1.add(new Button("Card One"));
    p1.add(new Button("Card  Two"));
    p1.add(new Button("Card  Three"));
    p1.add(new Button("Card  Four"));
    add("North",p1);
    
    Panel card1=new Panel();
    card1.add(new Label("This is the first Card"));
  
    Panel card2=new Panel();
    card2.add(new Label("This is the Second Card"));

    Panel card3=new Panel();
    card3.add(new Label("This is the Third Card"));
  
    Panel card4=new Panel();
    card4.add(new Label("This is the Forth Card"));
    
    p2=new Panel();
    layout=new CardLayout();
    p2.setLayout(layout);

    p2.add("Card 1",card1);
    p2.add("Card 2",card2);    
    p2.add("Card 3",card3);
    p2.add("Card 4",card4);
    add("Center",p2);
   }

  public boolean action(Event e, Object a)
  {
    if((e.target instanceof Component)&&((Component)e.target).getParent().equals(p1))
      layout.show(p2,(String)a);
    
    return true;
   }

private Panel p1;
private Panel p2;
private CardLayout layout;
}