近日学习到了Java内存管理相关的内容，了解了Java内存中Permanent、Old和Young Generation的概念，内容如下文：
Recently I was learning Java memory management and got some ideas about Permanent, Old and Young Generation concepts, which are mentioned in:
http://blog.csdn.net/watchnight/article/details/4987065
文中的第一张示意图让人一目了然，可惜是日文版。用Visio临摹了一下，作了一张英文版以方便大家参考。版权归原作者和Oracle所有。
The first chart in the article is useful however it’s in Japanese. I copy a English version with Visio and share it here. The copyright belongs to the originator and Oracle.
点击查看原图。
Click to enlarge.
