Structural Patterns

Question 1

What is the purpose of the ‘Adapter’ pattern?

Answer 1

Converts the interface of a class into another interface the client expect.

Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.

Question 2

What is the purpose of the ‘Composite’ pattern?

Answer 2

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

Composite lets clients treat individual objects and compositions of objects uniformly.

Question 3

What is the purpose of the ‘Decorator’ pattern?

Answer 3

Attaches additional responsibilities to an object dynamically.

Decorators provide a flexible alternative to subclassing for extending functionality.

Question 4

What is the purpose of the ‘Facade’ pattern?

Answer 4

Provides 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 5

What is the purpose of the ‘Flyweight’ pattern?

Answer 5

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

Question 6

What is the advantage of using a ‘Decorator’ pattern?

Answer 6

Decorators provide a flexible alternative to subclassing for extending functionality.

Question 7

What is the advantage of using a ‘Composite’ pattern?

Answer 7

Composite lets clients treat individual objects and compositions of objects uniformly.

Question 8

What is the advantage of using a ‘Facade’ pattern?

Answer 8

Facade defines a higher-level interface that makes the subsystem easier to use.

Question 9

What is the advantage of using a ‘Adapter’ pattern?

Answer 9

Adapter lets classes work together that couldn’t otherwise because of incompatible interfaces.