import java.awt.*;
import java.awt.event.*;

/**
* Makes use of an "anonymous" inner class to listen to the WindowClosing event.
*/
public class SimpleGUI
{
  private Frame     _frame;   // The frame for the GUI.

  public SimpleGUI()
  {
   _frame             = new Frame("Simple GUI");

   //Standard way to free system's resources for Window class when closing.
    _frame.addWindowListener (new CloseWindowListener());
    
    _frame.setSize (240, 300);
    _frame.setVisible (true);
  }

  /**
  *  Standard way to free system's resources for Window class when closing.
  */
  class CloseWindowListener extends WindowAdapter
  {
    public void windowClosing(WindowEvent e)
    {
        _frame.dispose (); //frees system's resources.
        System.exit(0);
    }
  }

/***
   * Entry point into the program
   * @param args The parameters for the entry.  They are not used here.
   */
  public static void main(String[] args)
  {
    new SimpleGUI();
  }
}