Classes and Objects – Multiple Choice Questions (MCQs)

1. 1. What is a class in Java?

   • A. An instance of an object
   • B. A blueprint for creating objects
   • C. A function within a module
   • D. A type of variable

2. 2. What is an object in Java?

   • A. A blueprint for creating classes
   • B. A specific instance of a class
   • C. A module containing functions
   • D. A type of loop

3. 3. Which keyword is used to define a class in Java?

   • A. class
   • B. object
   • C. def
   • D. type

4. 4. What is the process of creating an object from a class called?

   • A. Declaration
   • B. Instantiation
   • C. Initialization
   • D. Definition

5. 5. Which keyword is used to create an object in Java?

   • A. new
   • B. create
   • C. object
   • D. instance

6. 6. What is a constructor in Java?

   • A. A method with the same name as the class that is used to initialize objects
   • B. A special keyword for creating classes
   • C. A method used to delete objects
   • D. A return type of a method

7. 7. Can a class have multiple constructors in Java?

   • A. No
   • B. Only one
   • C. Yes
   • D. but they must have the same parameters

8. 8. What is constructor overloading in Java?

   • A. Defining multiple constructors in a class with the same name but different parameter lists
   • B. Defining a constructor in a subclass
   • C. Calling a constructor from another class
   • D. Defining a constructor with default parameters

9. 9. What is the default constructor in Java?

   • A. A constructor with no arguments that is automatically provided if no other constructor is defined
   • B. A constructor with default values for all parameters
   • C. The first constructor defined in the class
   • D. A constructor named 'default'

10. 10. What is the purpose of the `this` keyword in Java?

    • A. To refer to the current class
    • B. To refer to the superclass
    • C. To create a new object
    • D. To access static members

11. 11. How can `this` be used within a constructor?

    • A. To call another constructor of the same class
    • B. To access instance variables
    • C. To call instance methods
    • D. All of the above

12. 12. What are instance variables (or fields)?

    • A. Variables declared within a method
    • B. Variables declared outside any method but within the class
    • C. Variables declared with the `static` keyword
    • D. Variables passed as arguments to a method