Master Software Design Patterns: Enhance Your Coding Skills

Question 1

Which design pattern allows the creation of an object without specifying the exact class of the object to be created?

Accepted Answer

Factory Method

Answer

Builder

Answer

Singleton

Answer

Strategy

Question 2

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

Accepted Answer

Facade

Answer

Bridge

Answer

Proxy

Answer

Decorator

Question 3

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

Accepted Answer

Strategy

Answer

Command

Answer

Observer

Answer

Mediator

Question 4

Which design pattern defines a protocol for communication between objects?

Accepted Answer

Observer

Answer

Strategy

Answer

Command

Answer

Bridge

Question 5

Which of the following is NOT a consideration when selecting a design pattern?

Accepted Answer

Cost

Answer

Reusability

Answer

Performance

Answer

Simplicity

Question 6

Which design pattern provides a way to extend the functionality of an object without modifying its source code?

Accepted Answer

Decorator

Answer

Proxy

Answer

Facade

Answer

Builder

Question 7

Which of the following is **not** a recognized type of software design pattern?

Accepted Answer

Architectural

Answer

Creational

Answer

Structural

Answer

Behavioral

Question 8

Which of the following is **not** considered a benefit of using software design patterns?

Accepted Answer

Increased code complexity

Answer

Enhanced code reusability

Answer

Reduced development time

Answer

Improved software maintainability

Question 9

Which characteristic is unique to the Singleton pattern?

Accepted Answer

The class has a private constructor

Answer

Multiple instances of the class can coexist

Answer

The class is guaranteed to be thread-safe

Answer

The class utilizes the Factory Method pattern

Question 10

What is the key distinction between creational and structural patterns?

Accepted Answer

Creational patterns focus on object creation, while structural patterns focus on object relationships

Answer

Creational patterns are static, while structural patterns are dynamic

Answer

Structural patterns are more complex than creational patterns

Answer

Creational patterns require inheritance, while structural patterns do not

Question 11

What is the primary purpose of the Singleton design pattern?

Accepted Answer

To ensure that only one instance of a class can be created.

Answer

To provide a global access point to an object.

Answer

To simplify the creation of objects.

Answer

To create a factory for objects that are expensive to create.

Question 12

What is the purpose of the Strategy design pattern?

Accepted Answer

To define a family of algorithms, encapsulate each one and make them interchangeable.

Answer

To provide a way to store data in a flexible and extensible way.

Answer

To create a factory for objects that are expensive to create.

Answer

To simplify the creation of objects.

Question 13

What is the purpose of the Observer design pattern?

Accepted Answer

To define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

Answer

To provide a way to store data in a flexible and extensible way.

Answer

To create a factory for objects that are expensive to create.

Answer

To simplify the creation of objects.

Question 14

What is the purpose of the Factory Method design pattern?

Accepted Answer

To define an interface for creating objects, but let subclasses decide which class to instantiate.

Answer

To provide a global access point to an object.

Answer

To create a factory for objects that are expensive to create.

Answer

To simplify the creation of objects.

Question 15

What is the purpose of the Template Method design pattern?

Accepted Answer

To define the skeleton of an algorithm in a method, deferring some steps to subclasses.

Answer

To provide a global access point to an object.

Answer

To create a factory for objects that are expensive to create.

Answer

To simplify the creation of objects.

Question 16

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

Accepted Answer

Increased code complexity

Answer

Increased code reusability

Answer

Reduced development time

Answer

Enhanced code maintainability

Question 17

Which design pattern is used to generate objects without specifying the exact class of object to create?

Accepted Answer

Factory Method

Answer

Facade

Answer

Adapter

Answer

Singleton

Question 18

Which design pattern organizes objects into a tree-like structure, allowing them to represent a part of a hierarchy?

Accepted Answer

Composite

Answer

Decorator

Answer

Adapter

Question 19

Which design pattern provides a simplified interface to a complex system or set of subsystems?

Accepted Answer

Facade

Answer

Singleton

Answer

Adapter

Question 20

Which design pattern enables objects to subscribe to and respond to changes in the state of other objects?

Accepted Answer

Observer

Answer

Command

Answer

Strategy

Question 21

Which design pattern defines interchangeable algorithms, allowing an algorithm to be selected at runtime?

Accepted Answer

Strategy

Answer

Command

Answer

Observer

Question 22

Which design pattern stores a snapshot of an object's state, allowing it to be restored to that state later?

Accepted Answer

Memento

Answer

Command

Answer

Factory Method

Question 23

Which design pattern represents an operation as an object, allowing requests to be encapsulated, queued, logged, or undone?

Accepted Answer

Command

Answer

Strategy

Answer

Observer

Question 24

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

Accepted Answer

Singleton

Answer

Observer

Answer

Builder

Question 25

Which design pattern allows objects with incompatible interfaces to work together by providing an intermediary?

Accepted Answer

Adapter

Answer

Decorator

Answer

Singleton

Question 26

Which design pattern attaches additional responsibilities to an object dynamically without changing its structure?

Accepted Answer

Decorator

Answer

Factory Method

Answer

Command