Programmer Think

1, What is object-oriented The idea of object-oriented (OO) is very important for software development. Its concept and application have even gone beyond program design and software development, and extended to fields such as database system, interactive interface, application structure, application platform, distributed system, network manage ...

Structure 15 dynamic binding of messages Message polymorphism Message polymorphism is reflected in that the same message can be sent to different types of objects, so it will get different interpretations. For two classes with public inheritance relationship, one message can be sent to the base class object or to the derived class object. If ...

1, Global, static and local variables Global variables call the constructor at the beginning of the program and the destructor at the end of the program. Static variables call the constructor when the function is called for the first time and the destructor at the end of the program. They are called only once. The constructor is called when th ...

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 ...

8.3 succession 8.3.1 prototype chain Many object-oriented languages support two kinds of inheritance: interface inheritance and implementation inheritance. The former only inherits the method signature, while the latter inherits the actual method. Interface inheritance is not possible in ECMAScript because the function is not signed. Implemen ...

Structures and classes definition Place multiple objects together as a whole //definition struct str { int x; double y; }; //statement struct str; //Only the declaration only knows that str is a struct, but it is not known internally. At this time, str is incomplete type //However, str* mystr can be defined; The pointer size of all ...

object-oriented inherit Usage scenario: if multiple similar classes have the same attributes and methods, you can extract the same attributes and methods from the parent class Benefits: reduced code redundancy Deep inheritance: When creating a subclass object, will the parent class constructor be called? meeting If you create a s ...

catalogue Object model in inheritance Construction and deconstruction order in inheritance Verification Code: Inherit static member handling with the same name Verification Code: Object model in inheritance Question: which members inherit from the parent class belong to the subclass object?      1) all non static member properties in t ...

Six kinds of inheritance in graphic JS: prototype chain, stealing constructor, combinatorial inheritance, prototype inheritance, parasitic inheritance and combinatorial parasitic inheritance inherit There are two types of inheritance: Interface Inheritance and Implementation Inheritance. Interface Inheritance requires method signature. ...

1. Succession 1.1 implementation of inheritance Concept of inheritance Inheritance is one of the three characteristics of object-oriented. It can make subclasses have the properties and methods of the parent class, redefine them in subclasses, and append properties and methods Implement inherited formats Inheritance is implemented ...