In this HackerRank Java Iterator problem in java programming, you need to complete a method func. The method takes an ArrayList as input. In that ArrayList there are one or more integer numbers, then there is a special string "###", after that there are one or more other strings.


HackerRank Java Iterator problem solution


HackerRank Java Iterator problem solution.

import java.util.*;
public class Main
{
   static Iterator func(ArrayList mylist)
   {
      Iterator it=mylist.iterator();
      while(it.hasNext())
      {
         Object element = it.next();
         if(element instanceof String)
            break;
      }
      return it;
      
   }

   public static void main(String []argh)
   {
      ArrayList mylist = new ArrayList();
      Scanner sc=new Scanner(System.in);
      int n=sc.nextInt();
      int m=sc.nextInt();
      for(int i=0;i<n;i++)
      {
         mylist.add(sc.nextInt());
      }
      mylist.add("###");
      for(int i=0;i<m;i++)
      {
         mylist.add(sc.next());
      }
      
      
      Iterator it=func(mylist);
      while(it.hasNext())
      {
         Object element = it.next();
         System.out.println((String)element);
      }
      
   }
}


Second solution

import java.util.*;
public class Main{
    
   static Iterator func(ArrayList mylist){
      Iterator it=mylist.iterator();
      while(it.hasNext()){
         Object element = it.next();
if(element instanceof String)

            break;
        }
      return it;
      
   }
   @SuppressWarnings({ "unchecked" })
   public static void main(String []args){
      ArrayList mylist = new ArrayList();
      Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      int m = sc.nextInt();
      for(int i = 0;i<n;i++){
         mylist.add(sc.nextInt());
      }
      
      mylist.add("###");
      for(int i=0;i<m;i++){
         mylist.add(sc.next());
      }
      
      Iterator it=func(mylist);
      while(it.hasNext()){
         Object element = it.next();
         System.out.println((String)element);
      }
   }
}