We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
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));
}
}
Cookie support is required to access HackerRank
Seems like cookies are disabled on this browser, please enable them to open this website
An unexpected error occurred. Please try reloading the page. If problem persists, please contact support@hackerrank.com
Java Instanceof keyword
You are viewing a single comment's thread. Return to all comments →
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);
}