Java Internal Frame (JInternalFrame) - Swing Example

JDesktopPane desktop = new JDesktopPane();

MyInternalFrame frame = new MyInternalFrame();
frame.setVisible(true);

package com.java.myapp;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class MyForm extends JFrame {

	JDesktopPane desktop;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm frame = new MyForm();
				frame.setVisible(true);
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("ThaiCreate.Com Java GUI Tutorial");

		int inset = 50;
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		setBounds(inset, inset, screenSize.width - inset * 2, screenSize.height
				- inset * 2);

		desktop = new JDesktopPane();
		setContentPane(desktop);

		desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
		
		// Button Open
		JButton btnOpenFrame = new JButton("Open Frame");
		btnOpenFrame.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				createFrame(); 
			}
		});
		
		btnOpenFrame.setBounds(29, 11, 116, 23);
		desktop.add(btnOpenFrame);

	}

	protected void createFrame() {
		MyInternalFrame frame = new MyInternalFrame();
		frame.setVisible(true);
		desktop.add(frame);
		try {
			frame.setSelected(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

package com.java.myapp;

import java.awt.EventQueue;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;

public class MyInternalFrame extends JInternalFrame {

    static int openFrameCount = 0;
    static final int xOffset = 30, yOffset = 30;
    
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MyInternalFrame frame = new MyInternalFrame();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyInternalFrame() {
		super("Document #" + (++openFrameCount), 
	              true, //resizable
	              true, //closable
	              true, //maximizable
	              true);//iconifiable
		setBounds(100, 100, 450, 300);
		getContentPane().setLayout(null);
		
		setLocation(xOffset*openFrameCount, yOffset*openFrameCount);
		
		JLabel lblNewLabel = new JLabel("ThaiCreate.Com");
		lblNewLabel.setBounds(178, 109, 108, 14);
		getContentPane().add(lblNewLabel);

	}
}