Iterator 只能向前移动

ListIterator 却能双向移动

 

ListIterator.nextIndex()　　//得到下一个索引

ListIterator.previousIndex()　　//得到当前的索引

ListIterator.set()　　//替换最后一个访问的元素

public static void main(String[] args) {        // TODO Auto-generated method stub        List list = new ArrayList();        list.add("cat");        list.add("dog");        list.add("panda");        ListIterator listIterator = list.listIterator(1);    //从索引为1开始        while(listIterator.hasNext()){            String name =  (String)listIterator.next();            System.out.println(name + ",nextIndex:" + listIterator.nextIndex() +",previousIndex:"+listIterator.previousIndex());            listIterator.set(name + "set后");        }        listIterator = list.listIterator(1);    //从索引为1开始        while(listIterator.hasNext()){            String name =  (String)listIterator.next();            System.out.println(name);        }}//输出：dog,nextIndex:2,previousIndex:1panda,nextIndex:3,previousIndex:2dogset后pandaset后