http://www.cnblogs.com/hnrainll/archive/2013/11/06/3410042.html
http://www.blogjava.net/ldwblog/archive/2013/07/24/401919.html
http://blog.csdn.net/antony9118/article/details/51425581
JAVA GC 图解
原文：http://www.cnblogs.com/zengkefu/p/7436319.html
