swing ques- JFrame

[RajivAwadhesh kumar]

Hi,
I tried a swing program from HeadFirst Java which is as following..

package com.rajiv;

import javax.swing.JButton;
import javax.swing.JFrame;

public class Test1 {
	
	public static void main(String[] args) {
		
		JFrame frame = new JFrame();
		JButton button = new JButton("click me");
		
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		frame.getContentPane().add(button);
		
		frame.setSize(300, 300);
		
		frame.setVisible(true);
	}

}

Its written in the book that if we use frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
the program will quit as soon as we close the window(if we leave this out
it will just sit there on the screen forever).

But when i dont use the above line the program closes as well , when i click the close button.
So whats the use of the above code line?

[Wouter Oet]

Did you recompile? Because what the book says is correct.

[Rob Spoor]

The frame closes, but the JVM will continue to run. Just try it from the command line.

[Rob Camick]

Read the JFrame API to see what the default value is for that method. Once you know the default you should understand the behaviour.