Design Patterns - Structural

Question 1

Adapter

Answer 1

Convert the interface of a class into another interface clients expect. Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.

Question 2

Bridge

Answer 2

Decouple an abstraction from its implementation so that the two can vary independently.

Question 3

Composite

Answer 3

Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.

Question 4

Decorator

Answer 4

Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending funcionality.

Question 5

Facade

Answer 5

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.

Question 6

Flyweight

Answer 6

Use sharing to support large numbers of fine-grained objects efficiently.

Question 7

Proxy

Answer 7

Provide a surrogate or placeholder for another object to control access to it.