Behavioral Patterns


In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.

Chain of responsibility A way of passing a request between a chain of objects

Command Encapsulate a command request as an object

Interpreter A way to include language elements in a program

Iterator Sequentially access the elements of a collection

Mediator Defines simplified communication between classes

Memento Capture and restore an object's internal state

Null Object Designed to act as a default value of an object

Observer A way of notifying change to a number of classes

State Alter an object's behavior when its state changes

Strategy Encapsulates an algorithm inside a class

Template method Defer the exact steps of an algorithm to a subclass

Visitor Defines a new operation to a class without change