cardlayoutdemo.java

《精通Java Swing程序设计S》这本书所附带的JAVA程序写得很漂亮,都是SWING的实例子,很适合初学者。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CardLayoutDemo implements ActionListener{
     
     JPanel p1,p2,p3,p4;
     int i = 1;
     JFrame f;
     
    public CardLayoutDemo() {
    
    	f = new JFrame();
        Container contentPane = f.getContentPane();
        contentPane.setLayout(new GridLayout(2,1));
        
        p1 = new JPanel();
        Button b = new Button("Change Card");
        b.addActionListener(this);
        p1.add(b);
        contentPane.add(p1);
        
        p2 = new JPanel();
        p2.setLayout(new FlowLayout());
        p2.add(new JButton("first"));
        p2.add(new JButton("second"));
        p2.add(new JButton("third"));
        p3 = new JPanel();
        p3.setLayout(new GridLayout(3,1));
        p3.add(new JButton("fourth"));
        p3.add(new JButton("fifth"));
        p3.add(new JButton("This is the last button"));
        p4 = new JPanel();
        p4.setLayout(new CardLayout());
        p4.add("one",p2);
        p4.add("two",p3);
        ((CardLayout)p4.getLayout()).show(p4,"one");
        
        contentPane.add(p4);
        
	    f.setTitle("CardLayout");
	    f.pack();
        f.setVisible(true);
        
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                    System.exit(0);
            }
        });
    }
    
    public void actionPerformed(ActionEvent event)
    {
        switch(i)
        {
            case 1:
                ((CardLayout)p4.getLayout()).show(p4,"two");
                break;
            case 2:
                ((CardLayout)p4.getLayout()).show(p4,"one");
                break;
        }
        i++;
        if (i==3)
            i=1;
            
        f.validate();
    }
         
    public static void main(String args[]) {
    
        new CardLayoutDemo();
        
    }
}