ConcurrentHashMap: http://www.cnblogs.com/ITtangtang/p/3948786.html

HashMap: http://www.cnblogs.com/chenssy/p/3521565.html

TreeMap: http://blog.csdn.net/chenssy/article/details/26668941

HashMap: http://www.cnblogs.com/chenssy/p/3521565.html

LinkedHashMap: http://blog.csdn.net/u012889434/article/details/48055679

http://www.cnblogs.com/maowang1991/archive/2013/04/15/3023236.html

锁级别: http://blog.csdn.net/bluishglc/article/details/5626009

类加载机制: http://www.cnblogs.com/ityouknow/p/5603287.html
垃圾回收机制: http://www.cnblogs.com/andy-zcx/p/5522836.html

https://www.ibm.com/developerworks/cn/education/java/j-nio/