CardLayout布局管理器的使用

/**
* @(#)Text1.java
*
*
* @author qch
* @version 1.00 2011/10/1
*/






/**
*java.awt
*类 CardLayout
*ng.Object
* java.awt.CardLayout
*所有已实现的接口：
*LayoutManager, LayoutManager2, Serializable
*
*--------------------------------------------------------------------------------
*
*public class CardLayoutextends Objectimplements LayoutManager2, SerializableCardLayout 对象是容器的布局管理器。它将容器中的*每个组件看作一张卡片。一次只能看到一张卡片，容器则充当卡片的堆栈。当容器第一次显示时，第一个添加到 CardLayout 对象的组件为可*见组件。
*
*卡片的顺序由组件对象本身在容器内部的顺序决定。CardLayout 定义了一组方法，这些方法允许应用程序按顺序地浏览这些卡片，或者显示*指定的卡片。addLayoutComponent(ponent, ng.Object) 方法可用于将一个字符串标识符与给定卡片关联，以便进行快*速随机访问。
*/







import javax.swing.*;

import java.awt.*;

import java.awt.event.*;


public class Text1 extends JFrame implements ActionListener{


JButton b1 = new JButton("b1");

JButton b2 = new JButton("b2");

JButton b3 = new JButton("chose b2");

JButton b4 = new JButton("chose b1");

JPanel p1 = new JPanel();

JPanel p2 = new JPanel();

JPanel p3 = new JPanel();

JPanel p4 = new JPanel();

Container con;

CardLayout layout;



public static void main(String args[])
{

new Text1();

}








public Text1()
{
super("buttonDemo");

setSize(300,300);

con=getContentPane();

con.setLayout(new BorderLayout());

layout= new CardLayout(20,20);

p1.setLayout(layout);

con.add(p2,BorderLayout.SOUTH);

con.add(p1,BorderLayout.CENTER);

p3.add(b1);

p4.add(b2);

p1.add(p4,"b4");

p1.add(p3,"b3");

p2.add(b3);

p2.add(b4);

p3.setBackground(Color.black);

p4.setBackground(Color.green);

p1.setBackground(Color.blue);

p2.setBackground(Color.red);

// MyActionListener myActionListener = new MyActionListener();

b3.addActionListener(this);

b4.addActionListener(this);

setVisible(true);

setDefaultCloseOperation(3);


//class MyActionListener implements ActionListener
//{

//}
}



public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b3)

{

layout.show(p1,"b3");

//layout.show(p1,"b4");

}

else layout.show(p1,"b4");

}








/*public void paint(Graphics g)

{
setForeground(Color.red);


Graphics gp = p1.getGraphics();

gp.drawRect(30,30,30,30);

setForeground(Color.blue);

g.drawOval(50,50,50,50);


}*/

}