真金不怕火煉。
良好的習慣塑造優(yōu)秀的人生。
The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
你并不總能得到你想要的,但有時,你會得到你需要的。