Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

In JDK 1.4, assertions were introduced as a new mechanism for testing and debugging assumptions about Java code. In essence, assertions are compilable entities that execute at runtime, assuming ...

I don't suggest you use static variables unless the thing being used is truly global, and unlikely t5o ever be anything but global (be careful here). you should try to pass them into the ...