/*************************************************************
 * file: EmptyFrame1.java
 *
 * Synopsis:
 *	This continues the EmptyFrame.java saga.
 *	To allow the program to terminate properly, we
 *	introduce a class "Terminator"
 *	to implement the "WindowListener".  Then when we close
 *	the window, an instance of this class will catch the
 *	"close" message!  However, it is tedious to implement
 *	WindowListeners as it has 7 methods to implement.  Instead
 *	Java provides the class WindowAdaptor which implements
 *	WindowListener with all 7 methods defaulted to the null
 *	implementation.  You just need to extend WindowAdaptor
 *	to implement any of the 7 methods that is relevant to you.
 *	In the present example, we only implement the windowClosing
 *	method! In the following example, we further simplify this
 *	by implementing an anonymous extension of WindowAdaptor().
 *
 * Source: Core Java, vol.1, by Horstmann & Cornell
 * 	   Adapted for Visualization, Spring 2003
 * 	   Chee Yap (yap@cs.nyu.edu)
 *************************************************************/

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

class EmptyFrame1 extends JFrame {

  // Constructor:
  public EmptyFrame1() {
	setTitle("My Closeable Frame");
	setSize(300,200); // default size is 0,0
	setLocation(10,200); // default is 0,0 (top left corner)

	// Window Listeners
	addWindowListener(new WindowAdapter() {
	  	public void windowClosing(WindowEvent e) {
		   System.exit(0);
	  	} //windowClosing
	} );
  } 

  public static void main(String[] args) {
    JFrame f = new EmptyFrame1();
    f.show();
  } //main
} //class EmptyFrame1


/* NOTES:
	WindowAdapter() is class that implements WindowListers
	with null methods for all the 7 methods of WindowListeners!
	It is found in java.awt.event.*.
 */