Master Design Patterns in Computer Science: Enhance Your Code Quality

Question 1

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

Accepted Answer

Composite

Answer

Adapter

Answer

Facade

Answer

Command

Question 2

Which of the following is a recommended practice when using design patterns?

Accepted Answer

Select the simplest pattern that satisfies the requirements

Answer

Apply patterns uniformly throughout the project

Answer

Modify design patterns to meet specific needs

Answer

Implement all available design patterns in every project

Question 3

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

Accepted Answer

Increased code complexity

Answer

Diminished code flexibility

Answer

Limited code maintainability

Answer

Reduced code performance

Question 4

What is the primary role of the 'Context' object in the Strategy design pattern?

Accepted Answer

Maintains a reference to the current strategy

Answer

Defines the interface for the strategy

Answer

Executes the strategy

Answer

Creates new strategies

Question 5

Which design pattern is not considered a creational pattern?

Accepted Answer

Observer

Answer

Abstract Factory

Answer

Builder

Answer

Prototype

Question 6

Which type of design pattern defines a common interface for a set of classes?

Accepted Answer

Structural

Answer

Creational

Answer

Behavioral

Question 7

Which of the following is not an advantage associated with using design patterns?

Accepted Answer

Increased code complexity

Answer

Improved code quality

Answer

Increased code reusability

Answer

Reduced development time

Question 8

What is the main purpose of the Template Method design pattern?

Accepted Answer

To define an algorithm that can be overridden by subclasses.

Answer

To provide a common interface for multiple classes.

Answer

To create new objects by copying existing objects.

Question 9

Which of the following is not a responsibility of the Command design pattern?

Accepted Answer

Storing the history of requests

Answer

Encapsulating a request

Answer

Invoking the request

Question 10

What is a key benefit of using the Iterator design pattern?

Accepted Answer

Traversing a collection without exposing its internal structure

Answer

Adding new elements to a collection while iterating

Answer

Removing elements from a collection while iterating

Question 11

Which of the following is a common use case for the Decorator design pattern?

Accepted Answer

Extending the functionality of an object without modifying its source code

Answer

Creating new objects by combining existing objects

Answer

Providing a consistent interface for objects with different implementations

Question 12

Which of the following design patterns does NOT belong to the creational category?

Accepted Answer

Strategy

Answer

Factory Method

Answer

Singleton

Answer

Builder

Question 13

What is the purpose of the Adapter pattern?

Accepted Answer

Adapting interfaces of incompatible classes

Answer

Creating multiple instances of a class

Answer

Providing a unified interface for a set of related classes

Answer

Implementing a new interface for an existing class

Question 14

What does the Singleton pattern ensure?

Accepted Answer

Only one instance of a class can be created

Answer

Many instances of a class can be created

Answer

The state of an object is preserved across multiple instances

Answer

The interface of a class is consistent across instances

Question 15

Which design pattern is used to add new functionality to an existing object without modifying its structure?

Accepted Answer

Decorator

Answer

Proxy

Answer

Adapter

Answer

Facade

Question 16

What is the purpose of the Observer pattern?

Accepted Answer

Notifying multiple objects about a change in state

Answer

Creating a hierarchy of objects

Answer

Encapsulating complex logic

Answer

Mediating between multiple objects

Question 17

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

Accepted Answer

Facade

Answer

Adapter

Answer

Proxy

Answer

Decorator

Question 18

What is the key difference between the Command and Strategy patterns?

Accepted Answer

Command encapsulates a request and Strategy encapsulates an algorithm

Answer

Strategy encapsulates a request and Command encapsulates an algorithm

Answer

Command is used for undo/redo functionality and Strategy is not

Answer

Strategy is used for undo/redo functionality and Command is not

Question 19

Which of the following is not a creational design pattern?

Accepted Answer

Observer

Answer

Factory Method

Answer

Singleton

Answer

Builder

Question 20

What is the advantage of using the Template Method pattern?

Accepted Answer

Defines the skeleton of an algorithm and defers concrete steps to subclasses

Answer

Provides a way to create new objects without specifying their concrete classes

Answer

Encapsulates a set of independent requests into a single object

Answer

Hides the implementation details of an object from its clients