Programming - Design patterns in Software

Design patterns are recurring solutions to software design problems you find again and again in real-world application development. Patterns are about design and interaction of objects, as well as providing a communication platform concerning elegant, reusable solutions to commonly encountered programming challenges.

Creational Patterns
andand Abstract Factory	andandCreates an instance of several families of classes
andand Builder	andandSeparates object construction from its representation
andand Factory Method	andandCreates an instance of several derived classes
andand Prototype	andandA fully initialized instance to be copied or cloned
andand Singleton	andandA class of which only a single instance can exist

andandStructural Patterns
andand Adapter	andandMatch interfaces of different classes
andand Bridge	andandSeparates an objects interface from its implementation
andand Composite	andandA tree structure of simple and composite objects
andand Decorator	andandAdd responsibilities to objects dynamically
andand Facade	andandA single class that represents an entire subsystem
andand Flyweight	andandA fine-grained instance used for efficient sharing
andand Proxy	andandAn object representing another object

andandBehavioral Patterns
andand Chain	andandA way of passing a request between a chain of objects
andand Command	andandEncapsulate a command request as an object
andand Interpreter	andandA way to include language elements in a program
andand Iterator	andandSequentially access the elements of a collection
andand Mediator	andandDefines simplified communication between classes
andand Memento	andandCapture and restore an object's internal state
andand Observer	andandA way of notifying change to a number of classes
andand State	andandAlter an object's behavior when its state changes
andand Strategy	andandEncapsulates an algorithm inside a class
andand Template Method	andandDefer the exact steps of an algorithm to a subclass
andand Visitor	andandDefines a new operation to a class without change

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