polymorphism vs encapsulation

A pair of operations, such as new and delete, malloc, and free, or all custom operations, such as lock and unlock, are usually encountered in the project. For new, STL contains auto_ptr, which sometimes achieves a similar auto_ptr for every pair of objects and is not worth the candle, and violates the purpose of C ++ reuse. The code below is a solution to the above problem: Class A {public: void lock () {printf ("A: Lock \ n");} void unlock () {printf (":: unlock \ n ") ;}}; Class B {public: voi

Java understands polymorphism (cainiao) and java Polymorphism I am a freshman dog. The content is only my first experience. Sorry for the error. A beginner may have been very familiar with some new terms. Such as polymorphism, generics, inheritance, and interfaces. In fact, this is not very difficult. Don't be scared by the name, don't be afraid, and you will und

Source: http://blog.csdn.net/hihui/article/details/8604779 #include Class Base { Public int i; Base () { i = 99; Amethod (); } virtual void Amethod () { printf ("Base.amethod () \ n"); } }; Class Derived: Public Base { Public int i; Derived () { i =-1; } virtual void Amethod () { printf ("Derived.amethod () \ n"); } }; int main (int argc, char *argv[]) { Base *b = new Derived (); printf ("%d\n", b

[C ++] polymorphism (function overload and virtual function), polymorphism overload Polymorphism means that the same symbol or name has different interpretations under different circumstances. There are two manifestations of polymorphism: Compile-time polymorphism: diff

I often talk about duck and Polymorphism in python, and I often talk about python polymorphism. 1. What is polymorphism? 2. polymorphism in python Iii. Dynamic Language and duck type class P: def __init__(self, x, y): self.x = x self.y = y def __add__(self, oth): return P(self.x+oth.x, self.y+oth.y)

Design ideas for dynamic polymorphism: For related object types, identify a common set of functions between them, and then in the base class, declare these common functions as multiple common virtual function interfaces. Each subclass overrides these virtual functions to accomplish the specific function. The client's code (an action function) operates on these objects by pointing to a reference or pointer to the base class, and calls to virtual functi

){ map.show(); }};renderMap( googleMap ); // 输出： 开始渲染google地图 renderMap( baiduMap ); Now look for polymorphism in this code. When we send a "show map" message to the Google Map object and the Baidu map object, they will be called separately show , resulting in different execution results. The polymorphism of the object prompts us, "What to Do" and "How to do" can be separated, even if lat

){ map.show(); }};renderMap( googleMap ); // 输出： 开始渲染google地图 renderMap( baiduMap ); Now look for polymorphism in this code. When we send a "show map" message to the Google Map object and the Baidu map object, they will be called separately show , resulting in different execution results. The polymorphism of the object prompts us, "What to Do" and "How to do" can be separated, even if lat

Inheritance and Polymorphism in java, java Polymorphism Inheritance (extends ): 1: object is the parent (base) class of all classes. 2: subclass inherits all contents of the parent class except (private modifier and constructor ). 3: when creating a constructor manually, The subclass must call the constructor of the parent class. 4: in Java, a class can only have one direct parent class (only single in

Abstract classes realize polymorphism and abstract class Polymorphism 　　 I. What is polymorphism? Multiple forms: different objects make different actions for the same operation. Ii. Notes for abstract classes 1. abstract classes are modified using abstract 2. abstract methods can only be in abstract classes. 3. abstract classes cannot be instantiated. 4. There

IOS Development notes series-basics 3 (polymorphism, dynamic type, and dynamic binding), ios Polymorphism Polymorphism: the same name and different classes Make the ability of different classes to share the same method name become polymorphism. It allows you to develop a group of classes. Each class in this group can r

Python polymorphism instance analysis, python Polymorphism This example describes the Python polymorphism. Share it with you for your reference. The details are as follows: #! /Usr/bin/env python # polymorphism in python # class base (object): "" base class "" def _ init _ (self, name): self. name = name def printest

Polymorphism (virtual method) 1, in the parent class method to add virtual, this method can be a quilt class rewrite. Join override before the method of a subclass Polymorphism means that different objects receive the same message, which produces different behavior, and the same class shows different behavior characteristics in different situations. The role of polymorp