Summary

This chapter focuses on how the behavior of an application can be changed during runtime to achieve flexibility, modularity, and scalability. The following table shows you a summary of behavioral design patterns discussed in this chapter:

Design pattern	Summary
Chain of responsibility	Chaining multiple handlers to process the same request
Command	Creating an object of an operation to be invoked at a later time
Interpreter	Interpreting a language
Visitor	Handling problems associated with double dispatch
Memento	Storing various versions of an object
Observer	Sending notifications to all subscribers
State	Encapsulating state-specific operations
Strategy	Choosing an algorithm at runtime