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  1. Prepare
  2. Java
  3. Object Oriented Programming
  4. Java Instanceof keyword
  5. Discussions

Java Instanceof keyword

  • samsarbro
     + 0 comments

    This code is the most right code but yet it doesn't works saying * Wrong Answer :( 1/1 test case failed * Sample Test case 0 * Compiler Message * Wrong Answer * Input (stdin) 5 Student Student Rockstar Student Hacker * Your Output (stdout) 3 1 1 * Expected Output 3 1 1

    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 []argh)
   {
      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));
   }
}