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

Java Iterator

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  • gracelyganta
     + 0 comments
    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)//Hints: use instanceof operator

            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);
      }
   }
}

  • cavan981
     + 0 comments

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  • mohantymangaraj1
     + 1 comment

    Object element = it.next(); if(element instanceof String&&element.equals("###"))

  • igorrgoes
     + 2 comments

    i don't understand why writing the code like this:

         Object element = it.next();
     if(element instanceof String && !element.equals("###"))

    only prints "java"

    help me, please!

  • oanvekar_oa
     + 0 comments

    SIMPLE SOLUTION WOULD BE :- public static void main(String[] args) { /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

      Scanner sc = new Scanner(System.in);
  int m = sc.nextInt();
  int n = sc.nextInt();
  ArrayList myList = new ArrayList();
  for(int i=0;i < m;i++){
      myList.add(sc.nextInt());
  }
   myList.add("###");

   for(int j=0;j < n;j++){
      myList.add(sc.next());
  }

    int index = myList.indexOf("###");
    for(int i = index+1 ; i < myList.size(); i++){
        System.out.println(myList.get(i));
    }
}