Inheritance and Polymorphism in Object-Oriented Programming
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Questions and Answers

What does inheritance create in object-oriented programming?

  • A 'uses a' relationship among classes
  • A 'has a' relationship among classes
  • A 'is a' relationship among classes (correct)
  • A 'belongs to' relationship among classes

    • What kind of characteristics does a specialized object have in relation to the general object?

  • Subset of the characteristics of the general object
  • Opposite characteristics
  • Similar characteristics
  • All of the characteristics of the general object, plus additional special characteristics (correct)

    • Which term best describes the relationship between a post graduate student and a student?

  • Generalization
  • Specialization (correct)
  • Aggregation
  • Encapsulation

    • What term describes the relationship between an employee and a person?

    <p>'Is a' relationship</p> Signup and view all the answers

    Which relationship can be extended through inheritance in object-oriented programming?

    <p>'Is a' relationship</p> Signup and view all the answers

    What is the purpose of inheritance in object-oriented programming?

    <p>To create reusable classes with shared characteristics</p> Signup and view all the answers

    What is the term used for the relationship between a superclass and a subclass?

    <p>Parent-child relationship</p> Signup and view all the answers

    Which keyword is used in Java to define a subclass?

    <p>extends</p> Signup and view all the answers

    What happens to private members of the superclass in a subclass?

    <p>They are not inherited by the subclass</p> Signup and view all the answers

    Which keyword refers to an object's superclass in Java?

    <p>super</p> Signup and view all the answers

    When a subclass is instantiated, which constructor is executed first?

    <p>Superclass default constructor</p> Signup and view all the answers

    What must be the first Java statement in a subclass constructor when calling a superclass constructor?

    <p><code>super</code> keyword</p> Signup and view all the answers

    What is it called when a subclass method has the same signature as a superclass method?

    <p><code>Method overriding</code></p> Signup and view all the answers

    Which annotation should be used before a subclass method declaration to indicate method overriding?

    <p>@Override</p> Signup and view all the answers

    In a Salaried Employee class, how can the get_salary() method be modified to override the superclass method?

    <p><code>public double get_salary() { return salary + bonus - deductions ; }</code></p> Signup and view all the answers

    What happens to constructors when a subclass is instantiated?

    <p><code>Superclass default constructor is executed first</code></p> Signup and view all the answers

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