Introduction to Programming: Inheritance and Polymorphism
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Questions and Answers

What is the primary benefit of inheritance in OOP?

  • Code redundancy
  • Method hiding
  • Reusability (correct)
  • Code obfuscation
  • What is the term for a class above a specific class in the class hierarchy?

  • Superclass (correct)
  • Inherited class
  • Subclass
  • Parent class
  • How do you derive a class from a superclass in Java?

  • Using the 'super' keyword
  • Using the 'implements' keyword
  • Using the 'inherit' keyword
  • Using the 'extends' keyword (correct)
  • What is the purpose of a constructor in a subclass?

    <p>To implement the differences between the subclass and the superclass</p> Signup and view all the answers

    What happens when a subclass is instantiated?

    <p>Both the subclass's and superclass's constructors are called</p> Signup and view all the answers

    What is the purpose of the 'super' keyword in Java?

    <p>To access the superclass's methods</p> Signup and view all the answers

    What is the purpose of abstract classes in object-oriented programming?

    <p>To define broad types of actions possible with objects of all subclasses</p> Signup and view all the answers

    What happens when a class extends an abstract class and does not override the abstract method?

    <p>The subclass cannot be instantiated and becomes an abstract class</p> Signup and view all the answers

    What is the purpose of the abstract keyword in an abstract method?

    <p>To declare the method without implementation</p> Signup and view all the answers

    What is the result of using abstract classes in object-oriented programming class hierarchy?

    <p>A broad definition of behaviors at the top of the hierarchy</p> Signup and view all the answers

    What is the role of the subclass in an abstract class hierarchy?

    <p>To provide implementation details of the abstract class</p> Signup and view all the answers

    What guideline is recommended for using abstract classes in object-oriented programming?

    <p>Use abstract classes to define broad types of behaviors at the top of the hierarchy</p> Signup and view all the answers

    What is the primary requirement for using the super() call in a constructor?

    <p>It must be used as the first statement in a constructor.</p> Signup and view all the answers

    What is the purpose of the super keyword in a subclass constructor?

    <p>To initialize the superclass with the parameters provided.</p> Signup and view all the answers

    What is the consequence of using both the super() and this() calls in the same constructor?

    <p>The compiler will throw an error.</p> Signup and view all the answers

    What is the purpose of overriding methods in a subclass?

    <p>To provide a new implementation of a method that is different from the superclass.</p> Signup and view all the answers

    What is the role of the super keyword in referencing members of the superclass?

    <p>It is used to refer to members of the superclass.</p> Signup and view all the answers

    What happens when a subclass constructor does not explicitly call the superclass constructor?

    <p>The subclass constructor will call the default constructor of the superclass.</p> Signup and view all the answers

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