Overriding and overloading

Rewrite: if a method in a subclass has the same name and parameter as its parent class, we say this method is overwritten ). When a subclass object uses this method, it calls the definition in the subclass. For it, the definition in the parent class is "blocked. The overwritten function must be virtual or dynamic.

Overload: if multiple methods with the same name are defined in a class, they may have different numbers of parameters or different parameter types, it is called overloading ). The overloaded method can change the type of the returned value.

Hide: The base class and the derived class have the same function name, but the parameters are different. The function in the base class does not have a virtual identifier.