java面试中问题

HashMap数据结构

http://blog.csdn.net/weiyouyin/article/details/5693496

HashMap冲突

http://www.blogjava.net/yeshucheng/archive/2008/09/15/229053.html

乐观锁悲观锁

http://blog.csdn.net/sdyy321/article/details/6183412