Design Pattern - Java

Creational Patterns
Factory Pattern :
Used to create Object Through an interface

Abstract Factory Pattern :
Create an instance of several families of subclasses, It is one more level of abstraction in Factory Pattern

Singleton Pattern :
A class produces only a single instance of its

Builder Pattern :

Prototype Pattern : A pttern to clone an fully initialised object.

Structural Patterns

Adapter Pattern :

A class which connects unrelated classes through interfaces.

Bridge Pattern :
Interface and its implementation of an object is separateed Here.

Composite Pattern :

Used to defined tree structured objects

Decorator Pattern :

Used to add an object at runtime.

Facade Pattern :

A class whic represent entire sub system

Flyweight Pattern :
Proxy Pattern :

Behavioral Patterns (behavioral pattern can alter the program's running behavior.
)

Chain of Responsibility :
Way of passing a request between a chain of objects : Example Excelption handling.

Command Pattern :
command pattern is a design pattern in which an object is used to represent and encapsulate all the information needed to call a method at a later time



Interpreter Pattern :

Include Language Element in program
Example : "expression ::= plus | minus | variable"

Iterator Pattern :
Used to access collection of object in sequence.

Mediator Pattern :
provides a unified interface to a set of interfaces in a subsystem.

Momento Pattern :

This pattern gets the previous state of an object

Observer Pattern:

A way of notifying change to number of classes

State Pattern :
This pattern is used in computer programming to represent the state of an object. This is a clean way for an object to partially change its type at runtime.


Strategy Pattern :
Encapsulates an algorithm in inside a class.

Template Pattern :
- Define the skeleton of an algorithm in an operation, deferring some steps to subclasses.
- Template Method lets subclasses redefine certain steps of an algorithm without letting them to change the algorithm's structure.


Visitor Pattern :

adds a new operation in a class with out changing the class