Template method lets subclasses redefine certain steps of an algorithm without changing the algorithm s structure Behavioral Object Chain of Responsibility Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it. Behavioral Object Command Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations Behavioral Object Iterator Provide a way to access the elements of an aggregate object sequentially, without exposing its underlying representation Behavioral Object Mediator Define an object that encapsulates how a set of objects interacts. The object will appear to change its state. Behavioral Object Strategy Define a family of algorithms, encapsulate each one, and make them interchangeable.
Strategy lets the algorithm vary independently from clients that use it.
Behavioral Object Visitor Represent an operation to be performed on the elements of an object structure.