Learn how to test your Java web applications that use design patterns with this article. Discover how to identify, choose, and write the test cases for your web design patterns.

A tutorial highlighting the various design patterns in Java. Learn about the benefits and different types of design patterns.

A Java command-line program exploring factory, singleton, strategy, observer, composite, and façade design patterns in a university department use-case.

The Singleton Design pattern is a creational design pattern that states that one and only one instance of a class can exist throughout the lifetime of an application.

Although the Singleton design pattern—as evidenced below by the figure below—is one of the simplest design patterns, it presents a number of pitfalls for the unwary Java developer.