Simple Factory

Place variable code in a factory class.

Factory Method

Define an interface for creating an object, but let the subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.

Principles:

Encapsulate what varies

Program to interfaces not implementations

Open for extension, closed for modification

Depend on abstractions

Abstract Factory

Factory Pattern is concerned with encapsulating the decision about what type of products to create.

Loose Coupling Principle

Builder

Concerned with encapsulating the complexities of how we build an individual object. Separates the construction of a complex object from its representation so that the same construction process can create different representations.

Prototype Pattern

Specify the kinds of objects to create using a prototype instance, and create new objects by copying this prototype.

Singleton

Create only one instance.

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