+-------------------------+---+--------+--------+--------+----------+
| Class Type | | normal | static | sealed | abstract |
+-------------------------+---+--------+--------+--------+----------+
| Can be instantiated | : | yes | no | yes | no |
| Can be inherited | : | yes | no | no | yes |
| Can inherit from others | : | yes | no | yes | yes |
+-------------------------+---+--------+--------+--------+----------+一张图看懂normal,static,sealed,abstract 的 区别
原文：http://www.cnblogs.com/kmsfan/p/4560548.html