Applied Java™ Patterns

Chapter 2. Behavioral Patterns

• Chain of Responsibility 42

• Command 51

• Interpreter 59

• Mediator 77

• Iterator 69

• Memento 88

• Observer 94

• State 104

• Strategy 114

• Visitor 121

• Template Method 131

Introduction to Behavioral Patterns

Behavioral patterns are concerned with the flow of control through a system. Some ways of organizing control within a system can yield great benefits in both efficiency and maintainability of that system. Behavioral patterns distill the essence of proven practices into readily understood, well known, and easy-to-apply heuristics.

Behavioral patterns covered in this chapter are as follows:

• Chain of Responsibility –. To establish a chain within a system, so that a message can either be handled at the level where it is first received, or be directed ...