Chapter 13

Question 1

Purpose of Design Patterns

Answer 1

Make it easier to reuse successful Object-Oriented Designs

Question 2

Purpose of Abstract Factory

Answer 2

Create families of related or dependent objects without specifying their concrete class

Question 3

Purpose of Factory Method

Answer 3

Define an interface for creating an object, but let subclasses decide which class to instantiate.

Question 4

Purpose of Builder pattern

Answer 4

Separate the construction of a complex object from its representation.

Question 5

Purpose of Prototype Pattern

Answer 5

Create a prototypical instance and create new objects by copying this prototype

Question 6

Purpose of Singleton Pattern

Answer 6

Ensure a class only has one instance and provide a global point of access to it

Question 7

Purpose of Adapter Pattern

Answer 7

Convert the interface of a class into another interface clients expect.

Question 8

Purpose of Composite Pattern

Answer 8

Compose objects into tree structures to represent part-whole hierarchies.

Question 9

Purpose of Proxy Pattern

Answer 9

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