综合~~~~~~~~~~
UML几种难区分的类图中的关系
http://www.cppblog.com/API/archive/2011/03/31/143085.html

java中怎么理解“堆空间”和“栈空间“？
http://topic.csdn.net/u/20100103/22/eed8b022-7a4a-437f-8624-fe347869d33b.html

java 彻底理解 byte char short int float long double
http://www.sunxin.org/article/445.html

Java简单数据类型
http://www.csaidk.com/ncrefx/201010131039271233.htm