清华大学：JAVA教学课件：7-8

程序7-8：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CardLayoutDemo extends MouseAdapter {
JPanel p1,p2,p3,p4,p5;
JLabel l1,l2,l3,l4,l5;
//声明一个CardLayout 对象
CardLayout myCard;
JFrame frame;
Container contentPane;
public static void main (String args[]) {
CardLayoutDemo that = new CardLayoutDemo();
that.go();
}
public void go() {
frame = new JFrame ("Card Test");
contentPane = frame.getContentPane();
myCard = new CardLayout();
//设置CardLayout 布局管理器
contentPane.setLayout(myCard);
p1 = new JPanel();
p2 = new JPanel();
p3 = new JPanel();
p4 = new JPanel();
p5 = new JPanel();

//为每个JPanel创建一个标签并设定不同的
//背景颜色，以便于区分
l1 = new JLabel("This is the first JPanel");
p1.add(l1);
p1.setBackground(Color.yellow);

l2 = new JLabel("This is the second JPanel");
p2.add(l2);
p2.setBackground(Color.green);

l3 = new JLabel("This is the third JPanel");
p3.add(l3);
p3.setBackground(Color.magenta);
l4 = new JLabel("This is the fourth JPanel");
p4.add(l4);
p4.setBackground(Color.white);
l5 = new JLabel("This is the fifth JPanel");
p5.add(l5);
p5.setBackground(Color.cyan);
// 设定鼠标事件的监听程序
p1.addMouseListener(this);
p2.addMouseListener(this);
p3.addMouseListener(this);
p4.addMouseListener(this);
p5.addMouseListener(this);
//将每个JPanel作为一张卡片加入frame的内容窗格
contentPane.add(p1,"First");
contentPane.add(p2,"Second");
contentPane.add(p3,"Third");
contentPane.add(p4,"Fourth");
contentPane.add(p5,"Fifth");
//显示第一张卡片
myCard.show(contentPane,"First");
frame.setSize(300,200);
frame.show();
}
// 处理鼠标事件，每当敲击鼠标键时，即显示下一张卡片。
// 如果已经显示到最后一张，则重新显示第一张。
public void mouseClicked(MouseEvent e) {
myCard.next(contentPane);
}
}