On the open and closed principle

    Look at a passage from the design pattern , I think it's good to write it down , Do more verification in the future .

    to open up - Closed principle , Is the core of object-oriented programming . Following this principle can bring the huge benefits claimed by object-oriented technology , It's maintainable 、 Scalable 、 Reusable 、 Flexibility . Developers should abstract only those parts of the program that show numerous changes , However, it is also not a good idea to deliberately abstract every part of the program .

    Rejecting immature abstraction is just as important as abstraction itself .