JPanel not showing up

Question

Why is the UI not showing up in my code below:

public class GUI extends JPanel{

        public GUI(String name, String address, List reviews, Icon         


        

Answer 1

I guess JPanel cannot be a toplevel container. It has to be put inside a JFrame or JWindow to be shown

JFrame f=new JFrame();
f.add(test);
f.setVisible(true);