Executing Java Programs Without BlueJ

Question

I've created a program that includes a number of classes. I want to be able to pass it along to someone who doesn't have BlueJ installed on his computer. How can the program be executed or started from the command line prompt? In BlueJ, I create an object of a particular class and the rest is done within the methods of that class. (These methods are called in the constructor.) I added the following line to that main class:
public static void main (String [ ] args)But I'm not sure what to put in that method. I'm also not sure of the exact command to enter in the command line prompt to get the ball rolling. Help?
Any suggestions or helpful comments would be greatly appreciated!
Thanks,
Erica

Answer 1

This example may help:
public class HelloWorld {
    // Constructor does stuff
    public HelloWorld() {
        System.out.println("Hello World");
        // do other stuff
    // main method just creates a new HelloWorld object
    // the JVM exits when main returns
    // i.e. when the constructor returns in this case
    public static void main(String[] args) {
        new HelloWorld();
}On the command line all you need to do is compile HelloWorld.java so that you end up with HelloWorld.class. Then do the following (in the same directory as the class file):
java HelloWorldThat's it. Of course I'm not sure if BlueJ provides other non-standard libraries which may need to be in your classpath. That's a whole other issue.
John