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Java Interview Questions on Inheritance - 9

Question: 1

Why use inheritance

(A) Inheritance increases execution of program
(B) Inheritance is useful in code re-usability
(C) Inheritance minimizes programming loop holes
(D) None of the above

Level: Beginner Category of MCQ: inheritance

Question: 2

What is 'extends' in java inheritance?

(A) extends is a datatype
(B) extends is a keyword
(C) extends is a class
(D) extend is a package

Level: Beginner Category of MCQ: inheritance

Question: 3

class Capgemini{
    private int a;
    public Capgemini(){
        a=10; 
   }
}

public class Main extends Capgemini
{
	public static void main(String[] args) {
		Main obj = new Main();
		System.out.println(obj.a);
	}
}

(A) 0
(B) 10
(C) Compilation Error
(D) Exception

Level: Beginner Category of MCQ: inheritance

Question: 4

class Capgemini{
    protected int a;
    public Capgemini(){
        a=10; 
   }
}
public class Main extends Capgemini
{
	public static void main(String[] args) {
		Main obj = new Main();
		System.out.println(obj.a);
	}
}

(A) 0
(B) 10
(C) Compilation Error
(D) Exception

Level: Practitioner Category of MCQ: inheritance

Question: 5

How many levels of visibility Java has?

(A) 1
(B) 2
(C) 3
(D) 4

Level: Beginner Category of MCQ: inheritance

Question: 6

abstract class Writer {
 public static void write() {
 System.out.println("Reading...");
 }
}
class Author extends Writer {
 public static void write() {
 System.out.println("Reading book");
 }
}
public class Programmer extends Writer {
 public static void write() {
 System.out.println("Reading code");
 }
 public static void main(String[] args) {
 Writer w = new Programmer();
 w.write();
 }
}

(A) Reading...
(B) Reading Book
(C) Reading Code
(D) Compilation Error

Level: Practitioner Category of MCQ: inheritance

Question: 7

Which access modifier makes a member available only to classes within the same package or subclasses?

(A) Private
(B) Protected
(C) Public
(D) Package-Private

Level: Practitioner Category of MCQ: inheritance

Question: 8

class Feline {
 public String type = "f ";
 public Feline() {
 System.out.print("feline ");
 }
}
public class Cougar extends Feline {
 public Cougar() {
 System.out.print("cougar ");
 }
 void go() {
 type = "c ";
 System.out.print(this.type + super.type);
 }
 public static void main(String[] args) {
 new Cougar().go();
 }
}

(A) cougar c f
(B) feline cougar c c
(C) feline cougar c f
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

Question: 9

class Alpha {
 String getType() {
 return "alpha";
 }
}
class Beta extends Alpha {
 String getType() {
 return "beta";
 }
}
public class Gamma extends Beta {
 String getType() {
 return "gamma";
 }
 public static void main(String[] args) {
 Gamma g1 = new Alpha();
 Gamma g2 = new Beta();
 System.out.println(g1.getType() + " "
 + g2.getType());
 }
}

(A) alpha beta
(B) beta beta
(C) gamma gamma
(D) Compilation fails

Level: Practitioner Category of MCQ: inheritance

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Java Interview Questions on Inheritance - 9

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