import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.ListIterator; public class IteratorDemo {      public static void main(String[] args) {             List<Integer> list = new ArrayList<Integer>();// 创建列表             for (int i = 0; i < 10; i++) {// 向列表中增加10个元素                 list.add(i);             }             Iterator it = list.iterator();             System.out.print("ArrayList集合中的元素为：");             while(it.hasNext()){                 System.out.print(it.next()+" ");             }                  System.out.println();             System.out.println("逆序后为：");             ListIterator<Integer> li = list.listIterator();// 获得ListIterator对象             for (li = list.listIterator(); li.hasNext();) {// 将游标定位到列表结尾                 li.next();             }             for (; li.hasPrevious();) {// 逆序输出列表中的元素                 System.out.print(li.previous() + " ");             }         } }