JDeskTopPane

import javax.swing.ImageIcon;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Exe08 extends JFrame{
	public Exe08(){
		
		Exe04 f1 = new Exe04();
		Exe05 f2 = new Exe05();
		Exe06 f3 = new Exe06();
		ImageIcon imagem = new ImageIcon(new ImageIcon("src/background.jpg").getImage());
		JLabel label = new JLabel();
		JDesktopPane dp1 = new JDesktopPane();
		
		this.setSize(640,480);
		this.setVisible(true);
		this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
		this.add(dp1);
		
		label.setIcon(imagem);
		label.setSize(640,480);
		dp1.add(label);
		
		f1.setSize(250, 250);
		f1.setVisible(true);
		f1.setTitle("Janela Interna 1 ");
		
		f2.setSize(250,250);
		f2.setVisible(true);
		f2.setTitle("Janela Interna 2 ");
		
		f3.setSize(250,250);
		f3.setVisible(true);
		f3.setTitle("Janela Interna 3 ");	
		
		
		dp1.add(f1);
		dp1.add(f2);
		dp1.add(f3);
		dp1.setVisible(true);	
		
	}
	public static void main(String[] args) {
		Exe08 ex8 = new Exe08();
	}
}