Combining classes into one single class

Question

Hi
I have written a java application that incompasses many classes. When I complie my java code
the complier produced a ClassName.class file for the main class and each and every class.
When I run the application it needs all of the classes not just the main class.
Can someone please show me how to combine all the classes into a single Main class
as when I try and run the program :
i.e java Main.class it needs all the other classes too.
Basically what I am asking is can I compile my program such that all class information
is incorporated in the Main.class?
Thanks

Answer 1

Not really (and it wouldn't be a good idea if you could). You can define one class inside another, but they still produce separate .class files. What you do is to wrap all your class files up in a jar file usint the jar utility. You can add a "manifest" which specifies which is the main class. If you do that you can run the program simply with java -jar xxxx.jar