Thread: I am stumped.

Please post your source code here in the forum. If it is too big, make a smaller version that compiles and executes and shows the problem.

when my friends try to open it on their computers

What are your friends opening? What versions of java do they have? What version of the JDK did you create the program with?

My friends are trying to open, the .jar file, I created with netbean's build button. I had them update their java to the newest version. I am using the newest version of the JDK.

I have two .class files. Game.class is the main class file. and Window.class is the other one. When they try to run my program, it says "java couldn't find main class Game.class, java will now close." But the program works on my computer.

Game.class

import javax.swing.JFrame;
 
public class Game extends JFrame {
 
    public Game() {
        add(new Window());
        setTitle("Game");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(600, 400);
        setLocationRelativeTo(null);
        setVisible(true);
        setResizable(true);
    }
    public static void main(String[] args) {
        Game game = new Game();
    }
}

Window.class

import javax.swing.JPanel;
 
public class Window extends JPanel {
    public Window() {        
    }
}

MAINIFEST

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.2
Created-By: 1.7.0_03-b05 (Oracle Corporation)
Class-Path: lib/swing-layout-1.0.4.jar
X-COMMENT: Main-Class will be added automatically by build
Main-Class: Game

What about the versions of java?
Are you 1.7 and they are 1.6?

Originally Posted by Norm

What about the versions of java?
Are you 1.7 and they are 1.6?

I'm on the 1.7 JDk and I'm not sure what they are on whatever the newest version of JRE is, thats what they have.

I just figured it out. Yeah i just updated my other computer to the JRE 7 and now it works. Thanks for the help though.