Multiple Classes

[Ghost]

Hi,

I'm trying the Space Invaders tutorial (http://www.planetalia.com/cursos/index.jsp). I'm on part 13, which divides the code into classes. I'm using JBuilder and when I do this, I get error messages saying that the class I put in a new Java file doesn't exist. I put the java file in the same directory as the main class.

Can somebody please tell me what I'm doing wrong?

Thank you.

[Paul.Esson]

I can't give you much advice since I use eclipse. But check to see if the Classes are part of the same Package.

a package is eqivilent to a namespace in .NET.. Hope this helps

Paul

[Ghost]

thanx! one more question: do all the classes have to be in the same package?

[Paul.Esson]

no. if there not you can use

import whatever.you.called.it;

example

import java.math;

to import the java.math package (standard java package) if you wish to import say all packages in java.security you could use

import java.security.*;

Some people think its bad coding practice to do this though. I don't find it that messy and i think the jre could manage it ok (it does do optermizations).

[jwenting]

Compile the class you just created and JBuilder will see it. Sometimes it's not quite smart enough to see classes it created itself unless they're compiled.

As to packages: no, classes don't need to be all in the same package.
And a good thing too as otherwise you'd never be able to use any of the standard library which are all classes in packages.