Java 集合 ListIterator

import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

public class ListIteratorExample {
  public static void main(String a[]){
    ListIterator<String> litr = null;
    List<String> names = new ArrayList<String>();
    names.add("Shyam");
    names.add("Rajat");
    names.add("Paul");
    names.add("Tom");
    names.add("Kate");
    //Obtaining list iterator
    litr=names.listIterator();

    System.out.println("Traversing the list in forward direction:");
    while(litr.hasNext()){
       System.out.println(litr.next());
    }
    System.out.println("\nTraversing the list in backward direction:");
    while(litr.hasPrevious()){
       System.out.println(litr.previous());
    }
  }
}

Traversing the list in forward direction:
Shyam
Rajat
Paul
Tom
Kate

Traversing the list in backward direction:
Kate
Tom
Paul
Rajat
Shyam