Inheritance (and, by extension, polymorphism) in db4o really is that simple.
db4o中的继承(以及多态)其实就是这么简单。
When do you use polymorphism and when do you use delegates?
什么时候用多态，什么时候用委派？
The use of polymorphism can design and implement a scalable system.
利用多态性可以设计和实现一个易于扩展的系统。
The use of polymorphism can design and implement a scalable system.
利用多态性可以设计和实现一个易于扩展的系统。
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