David Geary’s series is a masterful introduction to many of the Gang of Four patterns in Java code. Design Patterns is canonical reading for software developers, but many new programmers are ...

We discuss some of the most common design ... factory class. The Singleton Pattern restricts the instantiation of a Class and ensures that only one instance of the class exists in the Java Virtual ...

The Command pattern is one of the 23 design patterns introduced with the Gang of Four design patterns ... Rafael del Nero is a Java Champion and Oracle Ace, creator of the Java Challengers ...