Going from .java source files to a .jar

If my source files are .java, how can I make a .jar out of them from the command line? I have 4 main files, each a class with plenty of inner classes...how do I turn those files into something jar.exe wants? And if/when I get the .jar archive created, how do I set the class with the main class? Thanks for any help guys and gals!
Fair

This is not new info, just restating previous replies 1 and 2. (In case there's a misunderstanding...)
You must create class files by compiling xxx.java with the java compiler, this creates xxx.class, which contains an intermediate 'bytecode' version of the source - it's not readable by humans. The xxx.class file can be interpreted (run) by the java interpreter, thus: java xxx **OR** it can be placed in a jar file, and if done properly the jar file is executable.The 2nd reply by kelle3 gives the way that the jar file is created. If the xxx.class file(s) can be interpreted, they are valid. I'm not sure what you're looking at when you say you 'opened mine', as that requires that you disassemble a class file, which I don't think you're doing.
If you're still having problems either 1) search the forums for '.jar', there are many threads like this, or 2) go here http://java.sun.com/docs/books/tutorial/jar/basics/index.html
Hope this assists.

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Going from .java source files to a .jar

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