public   class  InternalFrameDemo  extends  JFrame
                                implements  ActionListener {
    JDesktopPane desktop;

     public  InternalFrameDemo() {
         super ("InternalFrameDemo");

        //Make the big window be indented 50 pixels from each edge
        //of the screen.
         int  inset =  50 ;
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds(inset, inset,
                  screenSize.width  - inset* 2 ,
                  screenSize.height - inset* 2 );

        //Set up the GUI.
        desktop =  new  JDesktopPane(); //a specialized layered pane
        setContentPane(desktop);
        setJMenuBar(createMenuBar());
        createFrame(); //create first "window"
    }
    //Create a new internal frame.
     protected   void  createFrame() {
         final  MyInternalFrame frame =  new  MyInternalFrame();
        frame.setVisible(true); //necessary as of 1.3
        desktop.add(frame);
        /*
        Thread setter = new Thread(){
        	public void run() {
        		try {
					sleep(1000);
				} catch (InterruptedException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
        		try {
					frame.setSelected(true);
				} catch (PropertyVetoException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
        	}
        };
        setter.start();
        */
        frame.addInternalFrameListener( new  InternalFrameListener()
        {
			 public   void  internalFrameActivated(InternalFrameEvent e) {
				// TODO Auto-generated method stub
				System.out.println("Activated");
			}
			 public   void  internalFrameDeactivated(InternalFrameEvent e) {
				// TODO Auto-generated method stub
				System.out.println("Deactivated");
			}
			 public   void  internalFrameDeiconified(InternalFrameEvent e) {
				// TODO Auto-generated method stub
				
			}
			 public   void  internalFrameIconified(InternalFrameEvent e) {
				// TODO Auto-generated method stub
				
			}
			 public   void  internalFrameOpened(InternalFrameEvent e) {
				// TODO Auto-generated method stub
			}
			 public   void  internalFrameClosed(InternalFrameEvent arg0) {
				// TODO Auto-generated method stub
				
			}
			 public   void  internalFrameClosing(InternalFrameEvent arg0) {
				// TODO Auto-generated method stub
				
			}
			
        });
        frame.show();
         try  {
			frame.setSelected(true);
			System.out.println("request focus returned: " + frame.requestFocusInWindow());
		}  catch  (PropertyVetoException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    }
...
}