Structural Patterns

• Adapter
  converts the interface of a class into another interface that clients expect.
  
• Bridge
  Separates an object's interface from its implementation...(Many to Many)
• Composite
  A tree structure of simple and composite objects
• Decorator
  Add responsibilities to objects dynamically
• Facade
  A single class that represents an entire subsystem
• Flyweight
  A fine-grained instance used for efficient sharing
• Proxy
  An object representing another object

Bridge:

The Bridge pattern decouples an abstraction from its implementation, so that the two can vary independently. A household switch controlling lights, ceiling fans, etc. is an example of the Bridge. The purpose of the switch is to turn a device on or off. The actual switch can be implemented as a pull chain, simple two position switch, or a variety of dimmer switches.

Proxy:

The Proxy provides a surrogate or place holder to provide access to an object. A check or bank draft is a proxy for funds in an account. A check can be used in place of cash for making purchases and ultimately controls access to cash in the issuer's accou