Design Pattern Flashcards
Abstract Factory
Provides an interface for creating families of related or dependent objects without specifying their concrete classes
Adapter
Convert the interface of a class into another interface clients expect
Bridge
Decouple an abstraction from an implementation so the two can vary independently
Builder
Separate the construction of a complex object from its representation so that the same construction process can create different representations
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
Command
Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations
Composite
Compose objects into tree structures to represent part-whole hierarchies
Decorator
Attach additional responsibilities to an object dynamically
Facade
Provide a unified interface to a set of interfaces in a subsystem
Factory Method
Define an interface for creating an object, but let subclasses decide which class to instantiate
Flyweight
Use sharing to support large numbers of fine-grained objects efficiently
Interpreter
Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language
Iterator
Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation
Mediator
Define an object that encapsulates how a set of objects interact
Memento
Without violating encapsulation, capture and externalize an objects internal state so that the object can be resored to this state later
Observer
Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically
Prototype
Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype
Proxy
Provide a surrogate or placeholder for another object to control access to it
Singleton
Ensure a class only has one instance, and provide a global point of access to it
State
Allow an object to alter its behaviour when its internal state changes
Strategy
Define a family of algorithms, encapsulate each one, and make them interchangeable
Template Method
Define the skeleton of an algorithm in an operation, deferring some steps to subclasses
Visitor
Represent an operation to be performed on the elements of an object structure
