(Adapt Face for Decoration and cross a Bridge with help of Proxy)
Adapter Design Pattern (Structural) :
Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.
Wrap an existing class with a new interface.
Impedance match an old component to a new system
Example: Adapter for electronic devices
Facade Design Pattern (Structural):
Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use.
Wrap a complicated subsystem with a simpler interface.
Example: Consumers encounter a Facade when ordering from a catalog. The consumer calls one number and speaks with a customer service representative. The customer service representative acts as a Facade, providing an interface to the order fulfillment department, the billing department, and the shipping department.
Decorator Design Pattern (Structural)
:
Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality. Add behavior or state to individual objects at run-time. Note that this pattern allows responsibilities to be added to an object, not methods to an object’s interface.
Example: Attaching a standard disclaimer signature to an email. (signature is the decorator)
http://java.dzone.com/articles/design-patterns-decorator
Example: assault gun is a deadly weapon on it’s own. But you can apply certain “decorations” to make it more accurate, silent and devastating.
Bridge Design Pattern:
Decouple an abstraction from its implementation so that the two can vary independently
Example of Blog and Themes
https://simpleprogrammer.com/2015/06/08/design-patterns-simplified-the-bridge-pattern/
Example of TV Remote, and TV implementors like Sony, Philips, etc.
http://java.dzone.com/articles/design-patterns-bridge
Proxy Pattern:
is very similar to the Adapter pattern. However, the main difference between bot is that the adapter will expose a different interface to allow interoperability. The Proxy exposes the same interface, but gets in the way to save processing time or memory. Typically, you’ll want to use a proxy when communication with a third party is an expensive operation, perhaps over a network. The proxy would allow you to hold your data until you are ready to commit, and can limit the amount of times that the communication is called.