OOP consists of five aspects: object, message, method, class and inheritance.
OOP技术由对象、消息、方法、类和继承五个方面组成。
Inheritance: Annotations — Single table, joined table, and table per class.
继承：标注——单个表、联合表和按类表。
This class makes a link demand and an inheritance demand at the class level.
此类在类级别生成链接要求和继承要求。
This class makes a link demand and an inheritance demand at the class level.
此类在类级别生成链接要求和继承要求。
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