import java.awt.*;
import javax.swing.*;
public class CardLayoutDemo
{ 
  public static void main(String args[])
  { 
    JFrame frame=new JFrame("CardLayout布局");
    Container c=frame.getContentPane();
    c.setLayout(new CardLayout(30,30));
    c.add("card1",new JButton("卡片1"));
    c.add("card2",new JButton("卡片2"));
    c.add("card3",new JButton("卡片3"));
    c.add("card4",new JButton("卡片4"));
    frame.setSize(200,200);
    frame.setVisible(true);
  }
}