Why does my .jar file do nothing when double clicked?

Question

Hi all. Just got into java, though I do have a background in Visual Basic, PHP, C / C++ and JavaScript. Anyway, i've written a "Hello World" program and it runs successfully in the IDE, however when I run the .jar executeable file, nothing happens. Why? Thanks in advance.

Answer 1

I'm using NetBeans IDE, and I have everything set up correctly to the best of my knowledge. As said, no problems arise when running the application in the IDE, just running the .jar file directly is giving me problems. Here is the code if it provides any assistance in solving my problem:
package including;
* @author jayz
import java.io.*;
// #include <java.io.h>
public class Main
    //in Java, everything is encapsulated in2 classes, not functions
    public Main()
    //creates a Main() object
    public static void main(String[] args)
        System.out.println("Hi");
    //is our main function (method)
}