HashMap
http://blog.csdn.net/kimylrong/article/details/21654405
http://blog.csdn.net/vking_wang/article/details/14166593
LinkedHashMap
http://www.cnblogs.com/children/archive/2012/10/02/2710624.html
http://zhangshixi.iteye.com/blog/673789
对比
http://blog.csdn.net/xiyuan1999/article/details/6198394
缓存算法
http://www.cnblogs.com/dolphin0520/p/3749259.html
http://blog.jobbole.com/30940/
LRU算法
http://dennis-zane.iteye.com/blog/128278
http://blog.csdn.net/doufei_ccst/article/details/23094987
http://blog.chinaunix.net/uid-26147414-id-3435752.html
HashMap,LinkedHashMap,LRU,LFU等实现
原文：http://www.cnblogs.com/chuiyuan/p/4761630.html