In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

Create packages, import packaged classes and interfaces into your programs, move packages, and encapsulate them in jar files.

If you want to take advantage of sorting methods in Java, you'll need to implement the Comparable interface.

There is a reason why Java method modifiers exist. If you call public methods internally and don't understand why, your developers could face major class issues.

Learn how Remote Method Invocation (RMI), an application programming interface for Java, preserves the object model and its advantages across a network.