ThatQuiz Test Library Take this test now
Object-oriented programming
Contributed by: Grant
  • 1. Object-oriented programming (OOP) is a programming paradigm based on the concept of 'objects', which can contain data in the form of fields, and code in the form of procedures. Objects are instances of classes, which define the structure and behavior of the objects. OOP focuses on organizing code into reusable and modular components, allowing for better code organization and maintenance. Encapsulation, inheritance, and polymorphism are key concepts in OOP, providing mechanisms for data hiding, code reuse, and flexibility in implementation. By modeling real-world entities as objects, OOP promotes a clearer and more intuitive design approach to software development.

    What is the main concept behind object-oriented programming?
A) Encapsulation
B) Polymorphism
C) Inheritance
D) Abstraction
  • 2. Which keyword is used to create an object in Java?
A) var
B) this
C) new
D) class
  • 3. What is a class in object-oriented programming?
A) A variable in C++
B) A function in JavaScript
C) Blueprint for creating objects
D) An instance of an object
  • 4. What is polymorphism in object-oriented programming?
A) Hiding implementation details
B) Extending the functionality of a parent class
C) Creating objects from classes
D) Ability for objects of different classes to be treated as objects of a common superclass
  • 5. What is encapsulation in object-oriented programming?
A) Binding together the data and the methods that operate on the data
B) Creating multiple instances of an object
C) Overriding parent class methods
D) Inheriting properties from a parent class
  • 6. What is a constructor in object-oriented programming?
A) A method that returns a value
B) A method used to destroy objects
C) A special method that is automatically called when an object is created
D) A static method
  • 7. What is the 'super' keyword used for in Java?
A) Declaring a variable
B) Accessing a private method
C) Refers to the superclass of a class, used to call methods from the superclass
D) Implementing an interface
  • 8. What is method overloading in object-oriented programming?
A) Having multiple methods in a class with the same name but different parameters
B) Hiding the implementation details of a method
C) Creating new methods in a subclass
D) Overriding a method from a superclass
  • 9. What is data abstraction in object-oriented programming?
A) Overriding methods from a parent class
B) Accessing private class members
C) Hiding the implementation details while showing only the necessary details of an object
D) Creating multiple objects from a class
  • 10. What is a public access modifier in object-oriented programming?
A) Allows for class extension
B) Restricts access to within the same class only
C) Hides the object details
D) Allows a class, method, or field to be accessed by any other code in the same package or another package
  • 11. What is the 'final' keyword used for in Java?
A) Prevents modification of the class, method, or variable
B) Enables dynamic method binding
C) Forces method overriding
D) Allows multiple inheritance
  • 12. What is the purpose of method overriding in object-oriented programming?
A) To hide the implementation details of a method
B) To have multiple methods with the same name in a class
C) To provide a specific implementation of a method that is already provided by its superclass
D) To create new methods in a subclass
  • 13. Which term describes the ability to create new classes based on existing classes?
A) Abstraction
B) Inheritance
C) Polymorphism
D) Encapsulation
  • 14. Which feature allows the same method to be used for different types of objects?
A) Abstraction
B) Encapsulation
C) Inheritance
D) Polymorphism
  • 15. Which keyword is used to inherit a class in Java?
A) extends
B) this
C) implements
D) super
  • 16. Which of the following allows for multiple inheritance in C++?
A) Abstract Classes
B) Interfaces
C) Polymorphism
D) Virtual Inheritance
  • 17. Which access modifier allows a class to be accessed by any other class?
A) Protected
B) Private
C) Default
D) Public
  • 18. Which keyword is used to refer to the current object in Java?
A) new
B) this
C) extends
D) super
  • 19. Which keyword is used to prevent method overriding in Java?
A) static
B) public
C) abstract
D) final
  • 20. Which type of relationship reflects a 'has-a' relationship between classes?
A) Composition
B) Aggregation
C) Dependency
D) Inheritance
  • 21. Which principle is violated if a subclass cannot be substituted for its superclass?
A) Dependency Inversion Principle
B) Open/Closed Principle
C) Single Responsibility Principle
D) Liskov Substitution Principle
  • 22. Which design principle states that classes should be open for extension but closed for modification?
A) Interface Segregation Principle
B) Single Responsibility Principle
C) Open/Closed Principle
D) Liskov Substitution Principle
  • 23. Which relationship represents a situation where one class is dependent on another class?
A) Dependency
B) Inheritance
C) Composition
D) Aggregation
  • 24. Which design principle suggests that a class should have only one reason to change?
A) Open/Closed Principle
B) Single Responsibility Principle
C) Interface Segregation Principle
D) Liskov Substitution Principle
  • 25. A method that has the same name as the class it is defined in is known as a:
A) Mutator method
B) Accessor method
C) Destructor
D) Constructor
  • 26. Which feature allows a class to have multiple methods with the same name but different parameters?
A) Overloading
B) Overriding
C) Encapsulation
D) Inheritance
  • 27. What does the acronym 'DRY' stand for in the context of object-oriented programming?
A) Dynamic Reuse Yard
B) Data Representation Year
C) Don't Repeat Yourself
D) Do Repeat Yourself
  • 28. Which term is used to describe the act of restricting the way subclasses can modify a superclass?
A) Override
B) Overloading
C) Overpassing
D) Overriding
Created with That Quiz — where test making and test taking are made easy for math and other subject areas.