New Click here to Enroll in NaBFID Analyst Intro Class on May 6

    Question

    Which of the following statements about Constructors in

    Object-Oriented Programming is correct?
    A Constructors are used to initialize the state of an object at the time of its creation Correct Answer Incorrect Answer
    B Constructors can be inherited by subclasses Correct Answer Incorrect Answer
    C Constructors do not allow parameters Correct Answer Incorrect Answer
    D Constructors are always called explicitly by the programmer Correct Answer Incorrect Answer
    E A constructor can return a value like a regular function Correct Answer Incorrect Answer

    Solution

    A constructor is a special type of method in Object-Oriented Programming (OOP) that is automatically called when an object of a class is instantiated. The primary purpose of a constructor is to initialize the state of the object by setting initial values for its attributes (fields). Constructors are critical in ensuring that objects are properly initialized before they are used.

    • Why It Is Important: Constructors ensure that objects begin in a valid state, which avoids errors and simplifies the logic in the rest of the program. Without constructors, developers would need to manually initialize each object after its creation, leading to redundant and error-prone code.
    • Real-World Example: In a Person class, a constructor might be used to set the initial name, age, and address when a new object is created. For example, Person(String name, int age) would initialize the name and age attributes.
    Why Other Options Are Incorrect:
    • Constructors can be inherited by subclasses: Constructors are not inherited. However, a subclass can call the constructor of the parent class using the super() keyword.
    • Constructors do not allow parameters: Constructors can indeed accept parameters. These parameters are used to initialize the object with specific values at the time of instantiation.
    • Constructors are always called explicitly by the programmer: Constructors are called automatically when an object is created, so the programmer does not need to explicitly call them.
    • A constructor can return a value like a regular function: Constructors do not return any value, not even void . Their sole purpose is to initialize the object.

    Practice Next