OOP Intermediate Concepts Quiz

1. A static method belongs to the class rather than to instances of the class. True or false?

True

False

2. Protected members in a class are accessible to subclasses and classes in the same package. True or false?

True

False

Submit

4. What is the main purpose of the Singleton pattern?

To ensure only one instance of a class exists throughout the application

To create multiple instances efficiently

To define a family of algorithms

To decouple classes from their dependencies

5. A constructor is a special method that initializes an object when it is created. True or false?

True

False

6. Which of the following best describes composition in OOP?

Building complex objects by combining simpler objects as components

Inheriting from multiple parent classes

Creating objects without constructors

Using only primitive data types

Submit

8. An interface can contain implemented methods with a body. True or false?

True

False

9. What does the 'super' keyword do in a subclass?

Refers to the parent class and allows access to parent methods

Creates a new instance of the subclass

Prevents inheritance from occurring

Declares static variables

10. Which design pattern provides a way to create objects without specifying their exact classes?

Factory Pattern

Singleton Pattern

Observer Pattern

Strategy Pattern

11. Which of the following best defines encapsulation in object-oriented programming?

Bundling data and methods together while hiding internal details

Creating multiple objects from a single class

Inheriting properties from a parent class

Implementing multiple interfaces in one class

12. What is the Liskov Substitution Principle?

Subclasses should be substitutable for their parent classes without breaking functionality

Classes should only inherit from one parent

All methods must be overridden in subclasses

Interfaces cannot be used with inheritance

Submit

14. Which keyword is used to prevent a class from being subclassed in Java?

Final

Abstract

Sealed

Static

15. A class that implements an interface must define all methods declared in that interface. True or false?

True

False

16. Method overriding occurs when a subclass provides a specific implementation of a method already defined in its parent class. True or false?

True

False

17. What is an abstract class used for in OOP?

To define a template for subclasses and enforce implementation of specific methods

To store data without methods

To create instances directly

To replace the use of interfaces

18. Which access modifier restricts a member to be accessible only within its own class?

Private

Protected

Public

Static

19. In the context of OOP, what does polymorphism allow?

Objects of different classes to be treated through a common interface

A class to have only one method

Variables to store only one type of data

Methods to execute in a fixed sequence

20. What is the primary purpose of inheritance in OOP?

To reduce code duplication and promote reusability

To make programs run faster

To eliminate the need for methods

To create circular dependencies

General Programming Intermediate Object Oriented Concepts Quiz

1. A static method belongs to the class rather than to instances of the class. True or false?

2.

What first name or nickname would you like us to use?

2. Protected members in a class are accessible to subclasses and classes in the same package. True or false?

3. Method ____ occurs when multiple methods have the same name but different parameters.

4. What is the main purpose of the Singleton pattern?

5. A constructor is a special method that initializes an object when it is created. True or false?

6. Which of the following best describes composition in OOP?

7. The ____ principle states that software entities should be open for extension but closed for modification.

8. An interface can contain implemented methods with a body. True or false?

9. What does the 'super' keyword do in a subclass?

10. Which design pattern provides a way to create objects without specifying their exact classes?

11. Which of the following best defines encapsulation in object-oriented programming?

12. What is the Liskov Substitution Principle?

13. The term ____ refers to the ability of an object to take multiple forms.

14. Which keyword is used to prevent a class from being subclassed in Java?

15. A class that implements an interface must define all methods declared in that interface. True or false?

16. Method overriding occurs when a subclass provides a specific implementation of a method already defined in its parent class. True or false?

17. What is an abstract class used for in OOP?

18. Which access modifier restricts a member to be accessible only within its own class?

19. In the context of OOP, what does polymorphism allow?

20. What is the primary purpose of inheritance in OOP?