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