"Go" Java Collection class

http://blog.csdn.net/zhangerqing/article/details/8122075

http://android.blog.51cto.com/268543/400557/

http://blog.csdn.net/softwave/article/details/4166598

Http://www.blogjava.net/EvanLiu/archive/2007/11/12/159884.html

http://blog.csdn.net/zhangerqing/article/details/8193118

A:hashmap and Hashtable two classes implement the Map interface, both save K-v pair (Key-value pair) b:hashtable do not allow null values (key and value can not), hashmap allow null values ( Both key and value are available). The method of c:hashtable is synchronize, and HashMap is not, when multiple threads access Hashtable, they do not need to synchronize their methods, and HashMap must provide external synchronization. D: The iterator returned by the collection view method of all the HashMap classes is a quick failure: After the iterator is created, if the mappings are modified from the structure, except through the Remove method of the iterator itself, any other modification at any time, Iterators will throw concurrentmodificationexception. The main difference between Hashtable and HashMap is that the former is synchronous, and the latter is a fast failure mechanism.

"Go" Java Collection class