Amoroso.

Passou por isto,

import java.applet.Applet;

import java.awt.*;

import go.*;



//

// GoSquare class containing data representing a square,

// and a render method for drawing the square.

//



class GoSquare extends GoInterface

{

   GoTriangleFan  data;



   GoSquare()

   {

       data = new GoTriangleFan(4);



       data.xyz(0, -0.5, -0.5, 0.0);

       data.xyz(1,  0.5, -0.5, 0.0);

       data.xyz(2,  0.5,  0.5, 0.0);

       data.xyz(3, -0.5,  0.5, 0.0);

   }



   //

   // Interface render method.

   //

   public void render()

   {

       go.clear(Go.IMAGE);

       go.render(data);

       swap();

   }

}



//

// Java applet

//



public class square extends Applet

{

   public void init()

   {

       setLayout(new GridLayout(1, 1));

       add("Center", new GoSquare());

   }

}

Foi complicado, mas consegui chegar lá.