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JavaInstanceofKeyword.java

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// https://www.hackerrank.com/challenges/java-instanceof-keyword/problem

import java.util.ArrayList;

import java.util.Scanner;

public class JavaInstanceofKeyword {

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));

}

private 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;

}

class Student {}

class Rockstar {}

class Hacker {}