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