如何在 OO 设计中表示这一点

Question

A type has many subtypes.

A subtype is also a type.

How to represent these two statements in Object oriented design?

Class AbstractType{
}

Class Type extends AbstractType{
      List<Subtype> subtypes
}

Class Subtype extends Type{

}

Answer 1

That's basically the idea of subtyping/inheritance/polymorphism. Wiki . Exactly how to do it depends on the language/oop model.