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.

Most introductory Java texts take an implementation-centric stab at how to use interfaces and abstract classes. However, few provide a clear design distinction for choosing between these two ...

Implementing Interfaces: When a class implements an interface, you can think of the class as signing a contract, agreeing to perform the specific behaviors of the interface. If a class does not ...

The abstract keyword can be used in different ways for writing java classes to implement abstraction. We can have: 1.An abstract class with one or more abstract method (s) ...

Functional programming in Java is a new concept to those entrenched in traditional, server-side development. But, if developers can familiarize themselves with fundamental components such as the ...

How does the open-closed SOLID principle work in a Java program? Here we show you what this important principle means, and how to implement the open-closed principle in Java.