Java JFrame change Icon

I have learn about GUI programming using java this week. I have created a simple window (using JFrame) and get the default icon in titlebar is a default java icon. But, I dont like this default icon image and want to change with another image.

This is a complete code how to change JFrame icon image

package jframechangeicon;

import java.awt.Dimension;
import java.awt.Toolkit;

/**
 *
 * @author toto
 */
public class JframeChangeIcon extends javax.swing.JFrame
{
    public JframeChangeIcon()
    {
        setTitle("MainWindow");
        //change java image
        setIconImage(Toolkit.getDefaultToolkit().getImage(getClass().getResource("/jframeChangeicon/image/appicon.png")));
    }
    
    public static void main(String[] args)
    {
        JframeChangeIcon  frame = new JframeChangeIcon();
        frame.setSize(new Dimension(500, 300));
        frame.setVisible(true);
    }    
}

This is the Program Window result after JFrame change the icon

Download the complete source code how JFrame change the icon below.

Source code : jframeChangeIcon.zip