Demonstrate iterators. : Iterator « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. Iterator

Demonstrate iterators.

     

import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;

class IteratorDemo {
  public static void main(String args[]) {
    ArrayList<String> al = new ArrayList<String>();

    al.add("C");
    al.add("A");
    al.add("E");
    al.add("B");
    al.add("D");
    al.add("F");

    Iterator<String> itr = al.iterator();
    while (itr.hasNext()) {
      String element = itr.next();
      System.out.print(element + " ");
    }

    ListIterator<String> litr = al.listIterator();
    while (litr.hasNext()) {
      String element = litr.next();
      litr.set(element + "+");
    }

    itr = al.iterator();
    while (itr.hasNext()) {
      String element = itr.next();
      System.out.print(element + " ");
    }

    while (litr.hasPrevious()) {
      String element = litr.previous();
      System.out.print(element + " ");
    }
  }
}

   
    
    
    
  

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