4.CardLayout布局管理器

效果：

package com.lvshitech.gui;

import java.awt.CardLayout;
import java.awt.Container;
import javax.swing.JApplet;
import javax.swing.JButton;

public class CardLayoutDemo extends JApplet {
	private static final long serialVersionUID = 1L;
	CardLayout cl = new CardLayout(20, 40);
	// 组件在卡片中有边界
	JButton b1 = new JButton("卡片一");
	JButton b2 = new JButton("卡片二");
	JButton b3 = new JButton("卡片三");
	public void init() {
		Container c = getContentPane();
		c.setLayout(cl);
		c.add("card1", b1);
		c.add("card2", b2);
		c.add("card3", b3);
	}
}