Question

I have an A.java class which uses B.java class as an object.

When I compile A.java class, it throws a compile error message, since the Java compiler can not reference the B.java object at all. So, here is my question:

How do I compile A.java class if it includes another B.java class?

Eclipse is a great tool, but this tool is not useful when I need to compile a Java file for Java beans.

Answer 1

You haven’t explained how you’re trying to compile A.java, or whether you’ve already compiled B.java. If you haven’t compiled either of them yet, just compile them both together, e.g.

javac -d bin path/to/A.java path/to/B.java

If you’ve already compiled B, you need to make sure you’ve got the classpath right, e.g.

javac -d bin -cp path/to/Broot path/to/A.java

Note that the classpath value shouldn’t be the B.class file itself, nor even the directory containing B.class – but the root of the output hierarchy. So if B is in package foo.bar, and B.class is in directory /x/y/z/foo/bar you’d write:

javac -d bin -cp /x/y/z path/to/A.java