Master Software Design Patterns: Enhance Your Coding Skills

Question 1

Which of the following is a disadvantage of using software design patterns?

Accepted Answer

Increased code complexity

Answer

Enhanced code reusability

Answer

Improved code maintainability

Answer

Reduced development time

Question 2

How does the Singleton design pattern demonstrate the encapsulation principle?

Accepted Answer

Ensures only one instance of a class exists

Answer

Restricts class attributes to private access

Answer

Employs inheritance for subclass creation

Question 3

Which of the following is NOT a creational design pattern?

Accepted Answer

Observer

Answer

Prototype

Answer

Factory

Answer

Builder

Question 4

Which design pattern is used to define a family of algorithms, encapsulate each one, and make them interchangeable?

Accepted Answer

Strategy

Answer

Facade

Answer

Adapter

Answer

Factory

Question 5

Which design pattern provides a way to iterate over a complex object without exposing its internal representation?

Accepted Answer

Iterator

Answer

Command

Answer

Strategy

Answer

Visitor

Question 6

Which pattern allows you to add new functionality to an object without modifying its source code?

Accepted Answer

Decorator

Answer

Command

Answer

Strategy

Answer

Adapter

Question 7

Which design pattern is used to control access to a resource and ensure that only one object can access it at a time?

Accepted Answer

Singleton

Answer

Prototype

Answer

Factory

Answer

Builder

Question 8

Which design pattern defines a way to encapsulate a request and separate it from its execution?

Accepted Answer

Command

Answer

Adapter

Answer

Visitor

Answer

Singleton

Question 9

Which design pattern is used to create a class that acts as a surrogate or placeholder for real objects?

Accepted Answer

Proxy

Answer

Decorator

Answer

Factory

Answer

Builder

Question 10

Which design pattern is used to provide a way to dynamically add functionality to an existing object?

Accepted Answer

Decorator

Answer

Command

Answer

Factory

Answer

Builder

Question 11

Which design pattern is used to create a new object without specifying the exact class of the object to create?

Accepted Answer

Factory

Answer

Builder

Answer

Singleton

Answer

Observer

Question 12

Which design pattern is used to create a single shared instance of a class?

Accepted Answer

Singleton

Answer

Command

Answer

Adapter

Answer

Factory

Question 13

Which design pattern is used to create a complex object step by step?

Accepted Answer

Builder

Answer

Singleton

Answer

Prototype

Answer

Factory

Question 14

Which design pattern is used to allow a class to be created without the knowledge of the class to which it belongs?

Accepted Answer

Prototype

Answer

Decorator

Answer

Observer

Answer

Singleton

Question 15

Which design pattern defines a family of related classes and creates new objects without specifying their concrete classes?

Accepted Answer

Abstract Factory

Answer

Singleton

Answer

Prototype

Answer

Adapter

Question 16

Which of the following is a potential drawback of using software design patterns?

Accepted Answer

Increased code complexity

Answer

Reduced development time

Answer

Enhanced code reusability

Answer

Improved code maintainability

Question 17

Which design pattern provides a unified interface to a set of interfaces?

Accepted Answer

Adapter

Answer

Observer

Answer

Factory

Answer

Singleton

Question 18

Which design pattern is used to create a single instance of a class?

Accepted Answer

Singleton

Answer

Strategy

Answer

Observer

Answer

Factory

Question 19

Which design pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable?

Accepted Answer

Strategy

Answer

Adapter

Answer

Observer

Question 20

Which design pattern is used to attach additional responsibilities to an object dynamically?

Accepted Answer

Decorator

Answer

Factory

Answer

Adapter

Question 21

Which design pattern defines an object that encapsulates how a set of objects interact?

Accepted Answer

Mediator

Answer

Prototype

Answer

Factory

Answer

Observer

Question 22

Which design pattern is used to represent part-whole hierarchies of objects?

Accepted Answer

Composite

Answer

Decorator

Answer

Mediator

Answer

Observer

Question 23

Which design pattern provides a way to access an object without exposing its underlying implementation?

Accepted Answer

Proxy

Answer

Decorator

Answer

Adapter

Answer

Factory

Question 24

Which design pattern encapsulates a family of algorithms, making them interchangeable by providing a common interface? This pattern enables choosing the specific algorithm at runtime.

Accepted Answer

Strategy

Answer

Observer

Answer

Factory

Answer

Singleton

Question 25

Which design pattern establishes a one-to-many dependency between objects, ensuring that when one object's state changes, all dependent objects are notified and updated automatically?

Accepted Answer

Observer

Answer

Adapter

Answer

Strategy

Answer

Decorator

Question 26

Which design pattern simplifies the interface to a complex subsystem, providing a high-level, easy-to-use interface while hiding the underlying complexity?

Accepted Answer

Facade

Answer

Mediator

Answer

Decorator

Answer

Observer

Question 27

Which design pattern ensures that only one instance of a class can be created, providing a global point of access for that object?

Accepted Answer

Singleton

Answer

Facade

Answer

Factory

Answer

Mediator

Question 28

Which design pattern allows creating new objects by cloning an existing object? This pattern simplifies object creation, especially for complex objects.

Accepted Answer

Prototype

Answer

Factory

Answer

Builder

Answer

Singleton

Question 29

Which design pattern defines an interface for creating families of related objects without specifying their concrete classes? It allows creating sets of related objects without tightly coupling the client to specific implementations.

Accepted Answer

Abstract Factory

Answer

Prototype

Answer

Factory

Answer

Builder

Question 30

Which design pattern adapts an existing interface to a different interface expected by a client?

Accepted Answer

Adapter

Answer

Bridge

Answer

Decorator

Answer

Proxy

Question 31

Which design pattern defines a family of algorithms, encapsulates each one, and allows them to be used interchangeably?

Accepted Answer

Strategy

Answer

Observer

Answer

Decorator

Answer

Template Method

Question 32

Which design pattern ensures that only one instance of a class can be created?

Accepted Answer

Singleton

Answer

Factory

Answer

Prototype

Answer

Builder

Question 33

Which design pattern enables loose coupling between objects by allowing them to be notified of changes to another object?

Accepted Answer

Observer

Answer

Mediator

Answer

Strategy

Answer

Chain of Responsibility

Question 34

Which design pattern provides a way to traverse a collection of objects without exposing the underlying implementation details?

Accepted Answer

Iterator

Answer

Composite

Answer

Visitor

Answer

Factory

Question 35

Which design pattern allows an object's behavior to change based on its internal state?

Accepted Answer

State

Answer

Decorator

Answer

Singleton

Answer

Observer

Question 36

Which design pattern allows objects to be composed into tree structures representing part-whole hierarchies?

Accepted Answer

Composite

Answer

Observer

Answer

State

Answer

Bridge