The brocade set of inheritance and polymorphism

Inherited

First, let's take a look at the role of inheritance: Removing redundant code from a class

Here is the code show:

We first build a main function, a parent class (EXEC) and two subclasses (PM,CM)

 Public  classExec { Public intId {Get;Set; } Numbering Public stringName {Get;Set; } Name Public intAge {Get;Set; } Age PublicExec ()//non-parametric construction {} PublicExec (intIdstringNameintAge )//have a reference structure { This. Id =ID;  This. Name =name;  This. Age =Age ; }         Public voidsay ()//Create Say () method {Console.WriteLine ("I am the say method of the parent class, I am {0}, I am {1 years old}"); }    }

 Public classcm:exec { PublicCM () {} PublicCM (intIdstringNameintAge):Base(id,name,age)//base (id,name,age) invokes the parameter construct of the parent class {
　　　　　　　        }         Public voidsay () {Console.WriteLine ("I am the say method of the parent class, I am {0}, I am {1} years old", Name, age); }    }

 public  class   pm:exec { public   PM () {}  int  id,string  name,base   (id,name,age) {  public  void   Say () {Console.wri Teline (   I am the say method of the parent class, I am {0}, I am {1} years old.         ,name,age); }    }

classProgram {Static voidMain (string[] args) {PM PM=NewPM (001,"Manager", $);//Create a Manager Object Pm.say ();//Call the Say () method of the PM () subclass cm cm=NewCM (002,"Employees", -);//Create an Employee object Cm.say ();//Call the Say () method of the CM () subclass Console.readkey ();//Make Screen Stop}}

Complete

Polymorphic

The role of polymorphism: solving problems caused by inheritance

Let's start with a piece of code to understand the use of polymorphism, first we want to create a main function, a parent class (person), three subclasses (Korea,chinese,american)

 public  class   person { public  int   age;  public  virtual  void   Hello () {}}  

 public  class   American:person { public  override void   Hello () {Console.WriteLine ( Span> hello   "       ); }    }

 public  class   Chinese:person { public  override  void   Hello () {Console . WriteLine (   hello   " ); }    }

 Public class Korea:person    {       publicvoid  Hello ()       {           base. age=;           Console.WriteLine (" Kim Hee Sun greeting ");       }    }

classProgram {Static voidMain (string[] args) {Chinese Chinese=NewChinese (); American American=NewAmerican (); Korea Korea=NewKorea (); Polymorphic call person[] Pers={Chinese,american,korea}; foreach(Person iteminchpers)//Loop through {item.               Hello ();        } console.readline (); }    }

Complete

The use of the override, and the Virtal keyword is a common method of polymorphism inside

The Virtal keyword decoration method is called a virtual method. The virtual method syntax is as follows

Grammar

Access modifier virtual return type method name ()

{

Method body

}

The override keyword is used to modify the method, which is called a method rewrite. virtual methods can be overridden.

Grammar

Access modifier override return type method name ()

{

Method name

}

The brocade set of inheritance and polymorphism