http://blog.csdn.net/world_hello_100/article/details/50131497
http://www.cnblogs.com/LoveJenny/archive/2011/05/29/2060718.html
http://blog.csdn.net/iter_zc/article/details/42006811
http://www.infoq.com/cn/articles/java-memory-model-4/
原文：http://www.cnblogs.com/webundle/p/5923574.html