java reference:
http://blog.csdn.net/zhao251021539/article/details/6599407
GC:
http://blog.csdn.net/zsuguangh/article/details/6429592
java reference:
http://blog.csdn.net/zhao251021539/article/details/6599407
GC:
http://blog.csdn.net/zsuguangh/article/details/6429592