[@徐雷frank][¥20]你能解释一下里氏替换原则吗?

里氏置换原则（Liskov Substitution Principle），简称LSP。所有引用基类的地方必须能够透明的使用其子类对象。也就是说，只要父类出现的地方子类就能够出现，而且替换为子类不会产生任何错误或异常。

1、里氏替换原则，是非常经典的OOAD原则之一，Barbara Liskov提出来的
2、父类可以被子类替换Liskov Substitution Principle explained. As the name suggests, Liskov Substitution Principle prescribes substitutability of a class by its subclass. Broadly put, a class can be replaced by its subclass in all practical usage scenarios. This is actually in line with what Java also allows.