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.

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

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Java Instanceof keyword Hacker Rank Solution

Problem

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

5
Student
Student
Rockstar
Student
Hacker

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)
            a++;
         if(element instanceof Rockstar)
            b++;
         if(element instanceof Hacker)
            c++;
      }
      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(System.in);
      int t = sc.nextInt();
      for(int i=0; i<t; i++){
         String s=sc.next();
         if(s.equals("Student"))mylist.add(new Student());
         if(s.equals("Rockstar"))mylist.add(new Rockstar());
         if(s.equals("Hacker"))mylist.add(new Hacker());
      }
      System.out.println(count(mylist));
   }
}

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.

FAQ:

1. HackerRank Java All Problems Solutions

Hackerrank java problems solutions with practical program code examples and step-by-step full complete explanation.

2. Can HackerRank learn Java?

Welcome to the world of Java! In this challenge, we practice printing to stdout. The code stubs in your editor declare a Solution class and the main method. 

3. What is HackerRank Java test?

The HackerRank Skills Certification Test is a standardized assessment to help developers prove their coding skills.

4. Should I put HackerRank certificate on resume?

These certificates are useless, and you should not put them on your resume. The experience you gained from getting them is not useless. Use it to build a portfolio, and link to it on your resume. 

5. Can I retake HackerRank test?

The company which sent you the HackerRank Test invite owns your Test submissions and results. It’s their discretion to permit a reattempt for a particular Test. If you wish to retake the test, we recommend that you contact the concerned recruiter who invited you to the Test and request a re-invite

6. Can I learn Java per month?

you can’t master it in 1 month, it needs continuous hard work and experience. JAVA is a vast language even developers don’t know fully. you go in-depth about each particular class in java. Java is such a platform which have been used in all platform like android, web, and cloud so keep working on your interest. 

Where can I find HackerRank solutions in Java?

in this post you will get all the solutions of HackerRank java Problems.

Finally, we are now, in the end, I just want to conclude some important message for you

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