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Introduction to Programming 1: Inheritance

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Introduction to Programming 1: Inheritance

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Questions and Answers

What is the main benefit of inheritance in object-oriented programming?

Polymorphism

Encapsulation

Abstraction

Reusability (correct)

What is a subclass in Java?

Any class above a specific class in the class hierarchy

A class that can only inherit from one superclass

A class that cannot override methods

Any class below a specific class in the class hierarchy (correct)

How do you create a final class in Java?

Using the 'abstract' keyword

Using the 'static' keyword

Using the 'final' keyword (correct)

Using the 'extends' keyword

What does the 'extends' keyword do in Java?

Derives a class from another class Signup and view all the answers

What happens when a subclass overrides a method of its superclass?

The subclass method replaces the superclass method Signup and view all the answers

Why is it beneficial to override methods of superclasses in Java?

To customize behavior specific to the subclass Signup and view all the answers

What is the purpose of using 'extends' in the code snippet public class Student extends Person?

To inherit all the properties and methods of the existing class Person Signup and view all the answers

When a Student object is instantiated, what is the sequence of constructor execution based on the given code?

Inside Person:Constructor followed by Inside Student:Constructor Signup and view all the answers

What is the output of the program when the code snippet public static void main( String[] args ){ Student anna = new Student(); } is executed?

Inside Person:Constructor Inside Student:Constructor Signup and view all the answers

What does the 'super' keyword do in a subclass constructor?

It calls a constructor of its immediate superclass Signup and view all the answers

In which constructor definition can the super() call be used?

It can only be used in a subclass's constructor definition Signup and view all the answers

What happens if the super() call does not occur as the first statement in a subclass constructor?

It results in an error at compile time Signup and view all the answers

What does using 'super( "SomeName", "SomeAddress" );' do in the code snippet public Student(){ super( "SomeName", "SomeAddress" ); System.out.println("Inside Student:Constructor"); }?

It explicitly calls a specific constructor of its immediate superclass Signup and view all the answers

'This implies that the this() construct and the super() calls CANNOT BOTH OCCUR IN THE SAME CONSTRUCTOR.' What is the purpose of this rule?

'this()' and 'super()' cannot coexist to avoid ambiguity in method or constructor calls Signup and view all the answers

'A super constructor call in the constructor of a subclass will result in the execution of relevant constructor from the superclass, based on the arguments passed.' What concept does this statement explain?

Inheritance Signup and view all the answers

'Since a student is also a person, we decide to just extend the class Person'. Which concept does this statement illustrate?