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

class ExIntFrame extends JFrame
{
  JDesktopPane mydesktop = null;
  JInternalFrame f1 = null;

  ExIntFrame()
  {
    mydesktop = new JDesktopPane();
    setContentPane(mydesktop);
    f1 = new JInternalFrame("titolo 1",true,true,true,true);
    f1.setSize(new Dimension(200,50));
    f1.setVisible(true);
    mydesktop.add(f1);
    setSize(new Dimension(500,500));
    setVisible(true);
  }

  public static void main(String[] args)
  {
    ExIntFrame pao = new ExIntFrame();
  }

}