Java Instanceof keyword Hacker Rank Solution

Hello coders, In this post, you will learn how to solve Java Instanceof keyword Hacker Rank Solution. This problem is a part of the Java programming series. 

One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions.

Java Instanceof keyword Hacker Rank Solution
Java Instanceof keyword Hacker Rank Solution

Java Instanceof keyword Hacker Rank Solution


The Java instanceof operator is used to test if the object or instance is an instanceof the specified type.

In this problem we have given you three classes in the editor:

  • Student class
  • Rockstar class
  • Hacker class

In the main method, we populated an ArrayList with several instances of these classes. count method calculates how many instances of each type is present in the ArrayList. The code prints three integers, the number of instance of Student class, the number of instance of Rockstar class, the number of instance of Hacker class.

But some lines of the code are missing, and you have to fix it by modifying only  lines! Don’t add, delete or modify any extra line.

To restore the original code in the editor, click on the top left icon in the editor and create a new buffer.

Sample Input


Sample Output

3 1 1

Java Instanceof keyword Hacker Rank Solution

import java.util.*;
class Student{}
class Rockstar{   }
class Hacker{}
public class InstanceOFTutorial{
   static String count(ArrayList mylist){
      int a = 0,b = 0,c = 0;
      for(int i = 0; i < mylist.size(); i++){
         Object element=mylist.get(i);
         if(element instanceof Student)
         if(element instanceof Rockstar)
         if(element instanceof Hacker)
      String ret = Integer.toString(a)+" "+ Integer.toString(b)+" "+ Integer.toString(c);
      return ret;
   public static void main(String []args){
      ArrayList mylist = new ArrayList();
      Scanner sc = new Scanner(;
      int t = sc.nextInt();
      for(int i=0; i<t; i++){
         if(s.equals("Student"))mylist.add(new Student());
         if(s.equals("Rockstar"))mylist.add(new Rockstar());
         if(s.equals("Hacker"))mylist.add(new Hacker());

Disclaimer: The above Problem (Java Instanceof keyword) is generated by Hackerrank but the Solution is Provided by Chase2Learn. This tutorial is only for Educational and Learning purposes. Authority if any of the queries regarding this post or website fill the following contact form thank you.

Sharing Is Caring

Leave a Comment