# LSP | The Liskov Substitution Principle

通俗解释：

* 接受的参数（类型）范围比父类大，返回的类型范围比父类小。可以理解为子类比父类强，父亲能干的事情儿子一定可以，反过来不一定成立。
* 老爸（只有小学毕业）能做的事，儿子（大学生）能做，反之不成立。


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