Unable to run Java GUI programs with Ubuntu

Question

I am learning GUI in Java, and for that I have created a demo program:

import java.awt.*;

public class FrameDemo extends Frame {

    public FrameDemo(){
           


        

Answer 1

Check what your environment variable DISPLAY's value is. Try running a simple X application from the command line. If it works, check DISPLAY's value for the right value.

You can experiment with different values of and environment variable on a per invocation basis by doing the following on the command line:

DISPLAY=:0.0 

How are you calling your program?