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.

Get a deep dive into using method references in your Java programs, including stream operations, event listeners, and constructors and factories.

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.