Java code to implement close functionality into AWT design

With AWT java coding the ability to allow the user to close the window using the X in the top right hand
corner is not implemented as standard. Below is the Java code for creating a class which extends the standard
Frame class and allows you to implement the close functionality. To use this when creating a Class, instead
of extending(extends) the class frame extend the class ZFrameClose. i.e.
package awt;
import java.awt.*;
import java.awt.event.*;
public class ZButton extends ZFrameClose implements ActionListener{
	public ZButton(){
		super("This is the Frame showing buttons...");
		setLayout(new FlowLayout());
		for (int idx=0;idx<9;idx++){
			Button b = null;
			add(b = new Button("Button"+idx));
			b.addActionListener(this);
			b.setBackground(Color.RED);
			b.setForeground(Color.BLACK);
		}
	}
	public void actionPerformed(ActionEvent event){
		String cmd= event.getActionCommand();
		for (int idx = 0; idx < 99 ; idx++){
			String but = "Button"+idx;
			if (cmd.equals(but))
			   System.out.println("Button "+idx+
			   		        "  pressed.");
		}
	}
	public static void main(String[] args) {
		ZButton aDemo = new ZButton();
		aDemo.setVisible(true);
	}
}

//package awt;
import java.awt.*;
import java.awt.event.*;
public class ZFrameClose extends Frame {
	public ZFrameClose(String title) {
		super(title);
		setSize(300, 400);
		setLocation(235, 0);
		setWindowListener();
	}
	private void setWindowListener() {
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent event) {
				setVisible(false);
				dispose();
				System.exit(0);
			}
		});
	}
	public static void main(String[] args) {
		ZFrameClose aDemo = new ZFrameClose("This is the title" +
				" to the Frame");
		aDemo.setVisible(true);
	}
}

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