Java Iterator – Hacker Rank Solution

Java Iterator - Hacker Rank Solution
Java Iterator – Hacker Rank Solution

Problem :

Java Iterator class can help you to iterate through every element in a collection. Here is a simple example:

import java.util.*;
public class Example{
    public static void main(String []args){
        ArrayList mylist = new ArrayList();
        mylist.add("Hello");
        mylist.add("Java");
        mylist.add("4");
        Iterator it = mylist.iterator();
        while(it.hasNext()){
            Object element = it.next();
            System.out.println((String)element);
        }
    }
}

In this problem you need to complete a method func. The method takes an ArrayList as input. In that ArrayList there is one or more integer numbers, then there is a special string “###”, after that there are one or more other strings. A sample ArrayList may look like this:

element[0]=>42
 element[1]=>10
 element[2]=>"###"
 element[3]=>"Hello"
 element[4]=>"Java"

You have to modify the func method by editing at most 2 lines so that the code only prints the elements after the special string “###”. For the sample above the output will be:

Hello
 Java

Note: The stdin doesn’t contain the string “###”, it is added in the main method.

To restore the original code in the editor, click the top left icon on the editor and create a new buffer.



Java Iterator – Hacker Rank 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);
      }
   }
}

Disclaimer: The above Problem (Java Iterator) 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.

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