Cololection 介绍

1. List.contains();

2.List.indexof() ;???? -1

3.List.remove(entity)

4. Arrays.<entity>asList(entity,entity);

5.List.shuffle(list);? 洗牌打乱顺序

6.list.retainAll(list2);? 两个集合的交集

7.list.sublist(); //取得部分集合

8.list.containsAll(list);

9.list.listIterator([args]从第几位开始);??? hasNext()??? next()???? hasPrevious()????? previous()