New to Java

I cannot seem to set the icon in the upper left of the window or in the task. I am using NetBeans and it created my JFrame for me using the following code to initialize:

java.awt.EventQueue.invokeLater(new Unable() {
            public void run() {
                new MainFrame().setVisible(true);
            }
        });

I have checked online tutorials and this seem to be a trully easy task BUT my JFrame, MainFrame, seems not to have the method I need....

I should be able too do this:

MainFrame.setIconImage(Image image); 

But it seems I cannot get that method in my JFrame at all, it just doesnt show up in NetBeans and wont allow me to compile. I have tried looking at the base JFrame class and see no setIconImage there either. Any help would be apriciated.

KN