Memento

Command

State

Observer

Builder

Decorator

Composite

Singleton

Template Method

Abstract Factory

Bridge

Strategy

This type of patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities.

This type of patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator

This type of pattern are specifically concerned with communication between objects.

This type of pattern are specifically concerned with the presentation tier.

This pattern is used to decouple presentation tier and business tier from visitor.

In this pattern, a visitor class is used which changes the executing algorithm of an element class.

This pattern is used in visitors EJB persistence mechanism.

This pattern is used to separate unauthorized users from application's concerns.

This pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically.

This pattern is used to restore state of an object to a previous state.

This pattern is used to reduce communication complexity between multiple objects or classes.

This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.

Factory Pattern

Abstract Factory Pattern

Transfer Object Pattern

Singleton Pattern