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Java WindowListener & ActionListener

Java WindowListener & ActionListener

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//package java_window;
import java.awt.*;
import java.awt.event.*;

class Window
{
	Frame fra = new Frame();
	public static int tt = 1;
	public static Label lb = new Label(" label ");
	public void go() {
		fra.addWindowListener(
			new WindowAdapter(){
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		fra.setSize(700, 550);
		fra.setLayout(null);
		Button but = new Button(" OK ");
		but.setBounds(200, 200, 100, 70); fra.add(but);
		lb.setBounds(200, 300, 200, 100);  fra.add(lb);

		but.addActionListener(
			new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				 lb.setText("ActionEvent "+event.getActionCommand()+"   "+(tt++));
			}
		});
		fra.show();
	}
}

public class Main {
	public static void main(String[] args) {
		Window win = new Window();
		win.go();
	}
}