//WindowClosing.java

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

public class WindowClosing
{  
	public static void main(String[] args)
	{  
		SimpleFrame frame = new SimpleFrame();
		
		//設置用戶關閉框架時的響應動作
		frame.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
		
		//顯示該框架
		frame.show();  
   }
}

class SimpleFrame extends JFrame
{
	public SimpleFrame()
	{
		//設置框架大小
		setSize(WIDTH, HEIGHT);
	}
	
	public static final int WIDTH = 300;
	public static final int HEIGHT = 200;  	
}