Why wont this run in BlueJ?

Question

I am trying to do the free Stanford programming course online, but the programs wont run when executed. I believe I have successfully added the acm library to BlueJ, because when I compile the code, the imports are accepted, and it doesn't show any errors. But when I try and run the program, nothing happens, and all I see is the text, "Start: applet not initialized." Please, Please, Please help.

The code I am using in BlueJ is the following:

import acm.graphics.*;
import acm.program.*;

public class HelloProgram extends GraphicsProgram {
    public void run() {
        add(new GLabel("hello, world", 100, 75));
    }
}

Answer 1

First of all you have to install the AMCInvoker extension, then you create an instance of your class HelloProgram and call the start method.