Introduction to Programming: Inheritance and Polymorphism

Play an AI-generated podcast conversation about this lesson

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?

To implement the differences between the subclass and the superclass (A) Signup and view all the answers

What happens when a subclass is instantiated?

Both the subclass's and superclass's constructors are called (A) Signup and view all the answers

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

To access the superclass's methods (C) Signup and view all the answers

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

To define broad types of actions possible with objects of all subclasses (D) Signup and view all the answers

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

The subclass cannot be instantiated and becomes an abstract class (D) Signup and view all the answers

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

To declare the method without implementation (B) Signup and view all the answers

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

A broad definition of behaviors at the top of the hierarchy (D) Signup and view all the answers

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

To provide implementation details of the abstract class (C) Signup and view all the answers

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

Use abstract classes to define broad types of behaviors at the top of the hierarchy (D) Signup and view all the answers

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

It must be used as the first statement in a constructor. (C) Signup and view all the answers

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

To initialize the superclass with the parameters provided. (D) Signup and view all the answers

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

The compiler will throw an error. (A) Signup and view all the answers

What is the purpose of overriding methods in a subclass?

To provide a new implementation of a method that is different from the superclass. (D) Signup and view all the answers

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

It is used to refer to members of the superclass. (B) Signup and view all the answers

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

The subclass constructor will call the default constructor of the superclass. (A) Signup and view all the answers