Change Value to Reference
You have a class with many equal instances that you want to replace with a single object.
Turn the object into a reference object.
![](http://www.cnblogs.com/images/cnblogs_com/nanshouyong326/90398/o_20080126(020).jpg)
You have a class with many equal instances that you want to replace with a single object.
Turn the object into a reference object.