JDesktopPane和JInternalFrame

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

public class JInternalFrameDemo1 extends JFrame implements ActionListener{
	JDesktopPane desktopPane;
	int count = 1;
	
	public JInternalFrameDemo1(){
		super("JInternalFrameDemo1");
		Container contentPane = this.getContentPane();
		contentPane.setLayout(new BorderLayout());
		
		JButton button = new JButton("Crate New Internal Frames");
		button.addActionListener(this);
		contentPane.add(button,BorderLayout.SOUTH);
		
		desktopPane = new JDesktopPane();
		contentPane.add(desktopPane);//將虛擬桌面加入到content pane中
		
		this.setSize(new Dimension(300,300));
		this.setVisible(true);
		this.addWindowListener(new WindowAdapter(){
			@Override
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		});
	}
	
	@Override
	public void actionPerformed(ActionEvent e){
		JInternalFrame internalFrame = new JInternalFrame("Internale Frame"+count++,true,true,true,true);
		//internalFrame.setLocation(20,20);
		internalFrame.setSize(new Dimension(200,200));
		internalFrame.setVisible(true);
		
		Container icontentPane = internalFrame.getContentPane();
		JTextArea textArea = new JTextArea();
		JButton b = new JButton("Internale Frame Button");
		icontentPane.add(textArea,"Center");
		icontentPane.add(b,"South");
		
		desktopPane.add(internalFrame);//將internalFrame加入到desktopPane,通過虛擬桌面來管理internalFrame
		//this.getContentPane().add(internalFrame);
		try{
			internalFrame.setSelected(true);//獲得焦點
		}catch(java.beans.PropertyVetoException ex){
			System.out.println("Exception while selecting");
		}
	}
	public static void main(String...args){
		new JInternalFrameDemo1();
	}
}

參考：深入淺出Java Swing程序設計