Replacing Java Cup Image with Custom Image

Hi
i have a Jframe for which i want to replace the java cup icon that appears at the Top Left Most corner of the bar with a image of my own.How can i do this?

import javax.swing.*;
public class Test extends JFrame {
    public Test() {
        java.net.URL imgURL = Test.class.getResource("icon.jpg");
        setIconImage(new ImageIcon(imgURL).getImage());
        setSize(400,400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    public static void main(String[] args) {
        new Test();
}

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