A tutorial highlighting the various design patterns in Java. ... list the different types of design patterns, ... The object may also be in an inconsistent state and it may be built step-by-step.

See Introduction to design patterns for an overview of the four types of design pattern. When it was first introduced, the Command pattern was sometimes explained as callbacks for Java .

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 ...