JDesktopPane help!

[Dillinger4]

I decided to start a new project but i haven't coded a gui in a while. I've been trying to use a JDesktopPane but when i create a new instance of it, set it's size then visibility i get nothing .

 import java.awt.*; 
 import javax.swing.*; 
 import java.awt.event.*; 

 public class Test{
  public static void main(String[] args) {
   JDesktopPane jdp = new JDesktopPane(); 
   jdp.setSize(600,600); 
   jdp.setVisible(true); 
  }
 }