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.

For new Java programmers, the JOptionPane class is a great visual and user-friendly introduction to user input and Swing-based programming. Here's how to get started.

Integrating Excel and Word documents into Java applications has always been difficult. This article describes the new Microsoft Word and Microsoft Excel XML document formats: SpreedsheetML and ...