C # Object-oriented programming

Before the advent of object-oriented programming, almost all programs are process-centric, and the program runs from one place to the next to achieve a certain purpose. And the program's Code modification and reuse rate is low. Object-oriented programming regards the whole world as a set of entities, all individuals are objects. An object is a collection of entities with certain properties and behaviors. The table below roughly illustrates the difference between process-oriented programming (OPP) and object-oriented programming (OOP).

Opp

Oop

A Classes and objects

People who have studied C + + or Java before have a better understanding of classes and objects; objects are an integral part of a OPP application that encapsulates part of the application, which can be a process, data, and some more abstract entities. A class consists of members and methods. These include: Properties, fields, and methods in C # 's classes. The following is described in turn.

Properties and fields can access the data contained in the object, which can be used to distinguish between different objects because the properties and fields of an object are unique. Let's look at how classes are defined in C #.

Field:

Field: Class School//defines a category { public string Schoolname; } // Class classname{ <code> }

Property: Class School { private string Schoolname; public string Schoolname; { get {return this. schoolname;} set {this. schoolname=value;} }

The difference between a property and a field: A property is a logical field; A property is an extension of a field from a field; a property does not occupy the actual memory, and the field occupies the memory location and space. Most directly, the attribute is "externally used", and the field is "used internally." Let's learn the next person class below. This article is published in the introductory web of programming: www.bianceng.cn

class person//definition of a type { Public String name;//Field public String sex; Field public int age; Field public double weight; Field Public person ()//constructor, initializing object { Name= "LFC";/ Sex= "man";/ age=1;// weight=10;//initialization of four fields; } Public person (String name,string sex,int age,double weight) {//constructor, initialization of specified object This.name=name; This.age=age; This.weight=weight; This.sex=sex; }//about this and then elaborate on it later. It's understood here as "this." Methods in the public void Eatfood (double quanity)//Class { Double temp=this.weight;//details about this later. It's understood here as "this." this.weight=temp+quanity; } Methods in the public void Pushsth (Double liang)//class { Double temp=this.weight; This.weight=temp+liang; }}

Person Mywife=new to create an object for the person class. Console.WriteLine (Mywife.weight); Mywife.eatfood (22);//Call function Console.WriteLine (Mywife.weight); Mywife.pushsth (3.2);//Call function Console.WriteLine (Mywife.weight);

To be continued < Please teach yourselves what you do not know in the person class >