Design Patterns GOF

Creational Patterns

• Abstract Factory: Creates an instance of several families of classes
• Builder: Separates object construction from its representation
• Factory Method: Creates an instance of several derived classes
• Prototype: A fully initialized instance to be copied or cloned
• Singleton: A class in which only a single instance can exist

Note: To remember CP best is ABFPS (Abraham Became First President of States).

Structural Patterns

• Adapter: Match interfaces of different classes
• Bridge: Separates an object’s abstraction from its implementation
• Composite: A tree structure of simple and composite objects
• Decorator: Add responsibilities to objects dynamically
• Façade: A single class that represents an entire subsystem
• Flyweight: A fine-grained instance used for efficient sharing
• Proxy: An object representing another object

Note: To remember SP best is (ABCDFFP)

Behavioral Patterns

• Mediator: Defines simplified communication between classes
• Memento: Capture and restore an object's internal state
• Interpreter: A way to include language elements in a program
• Iterator: Sequentially access the elements of a collection
• Chain of Responsilibity: A way of passing a request between a chain of objects
• Command: Encapsulate a command request as an object
• State: Alter an object's behavior when its state changes
• Strategy: Encapsulates an algorithm inside a class
• Observer: A way of notifying change to a number of classes
• Template Method: Defer the exact steps of an algorithm to a subclass
• Visitor: Defines a new operation to a class without change

Note: Just remember BP Music....... 2 MICS On TV (MMIICCSSOTV).