Software Engineering Software Design Patterns

Question 1

Which design pattern ensures a class has only one instance and provides a global point of access to it?

Accepted Answer

Singleton

Answer

The Singleton pattern restricts instantiation of a class to a single object and provides a global access point.

Question 2

The Factory Method pattern is classified under which category of design patterns?

Accepted Answer

Creational

Answer

The Factory Method pattern is a Creational pattern that defines an interface for creating objects but lets subclasses decide which class to instantiate.

Question 3

Which pattern attaches additional responsibilities to an object dynamically without subclassing?

Accepted Answer

Decorator

Answer

The Decorator pattern wraps an object to add new behaviors dynamically at runtime.

Question 4

The Observer pattern is best described as which type of relationship?

Accepted Answer

One-to-many

Answer

The Observer pattern defines a one-to-many dependency so that when one object changes state, all its dependents are notified automatically.

Question 5

Which pattern provides a simplified interface to a complex subsystem?

Accepted Answer

Facade

Answer

The Facade pattern provides a unified, simplified interface to a set of interfaces in a subsystem.

Software Engineering Practice Test

Software Engineering Practice Test

Software Engineering Software Design Patterns