Programmer Think

Understanding of polymorphism: The so-called polymorphism refers to the specific type pointed to by the reference variable defined in the program and the method call issued through the reference variable. It is not determined during programming, but only during the running of the program, that is, a reference variable will point to the instance ...

8. Polymorphism In object-oriented programming language, there are three characteristics: encapsulation, inheritance and polymorphism. Polymorphism separates two concepts: what to do and how to do. What to do corresponds to the interface and how to do corresponds to the implementation. Polymorphism can improve the organization and readabilit ...

What is polymorphism? (understanding of the meaning of downward transformation) Professional perspective: multiple objects of the same kind have different reactions and effects when receiving the same message; From the perspective of code form: the object variable of the parent class calls the method overridden in the subclass (Note: ther ...

static keyword Features of static keyword: 1) Loads as the class loads 2) Priority object exists: It cannot coexist with this (this: represents the address value reference of the current class object) When the object does not have new, the member currently modified by static has memory 3) Statically modified Can be shared by multiple obj ...

1. Destructor cannot be overloaded Reason: the destructor cannot be overloaded because it can only have one and cannot take parameters. 2. Why is the destructor of the base class a virtual function? When implementing polymorphism, when the derived class is operated with the base class, the situation that only the base class is destructed ...

I polymorphic 1. Class polymorphism Requirements: Demand: teachers go to work by bike Analysis: teachers, bicycles Demand upgrade / iteration: Bicycle - > car Steps: 1. Create a Car class and write start and stop 2. Write open and close based on the original Teacher class Note: violation of OCP principles OCP - opening an ...

I hope you don't deliberately live in pursuit of a number. I hope you find the real valueYou must insist on being yourself, calm down and do what you like, and then give yourself to fate inherit Basic syntax of inheritance When defining these classes, the members of the lower level have their own characteristics in addition to the co ...

ps: Learning Meet the crazy God My study notes Process oriented & object oriented Process oriented thought The steps are clear and simple, what to do in the first step, what to do in the second stepFacing the process, it is suitable to deal with some relatively simple problems Object oriented thought Birds of a feather flock togeth ...

Is the virtual function table a class? 1. The virtual function table belongs to a class, and all objects of the class share the virtual function table of this class. 2. The virtual function tables of different objects are the same (the first function address of the virtual function table is the same); 3. A pointer vptr pointing to the virtual f ...