Structural Pattern Designs

Question 1

Adapter

Answer 1

Convert the interface of a class into another interface clients expect. / Adapter lets classes work together, that could not otherwise because of incompatible interfaces.

Question 2

Bridge

Answer 2

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

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

add additional responsibilities dynamically to an object.

Question 5

Flyweight

Answer 5

use sharing to support a large number of objects that have part of their internal state in common where the other part of state can vary.

Question 6

Memento

Answer 6

capture the internal state of an object without violating encapsulation and thus providing a mean for restoring the object into initial state when needed.

Question 7

Proxy

Answer 7

provide a “Placeholder” for an object to control references to it.