For instance, you might want to control how long the alarm clock will stay in snooze mode. In order to add such a feature, you need to understand how Java controls data.

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.

This post explains how to use variables in Java. Learn the primitive types (and what that means) and just why variables are so important for any coding!