"Learning notes" C # encapsulation and inheritance

• Packaging
  • Encapsulation is the first step in implementing object-oriented programming
  • Encapsulation is the collection of data, methods, etc. in a unit, which we call class
  • The meaning of encapsulation is to protect code/data, shielding complexity
• Inherited
  • Inheritance is an integral part of all object-oriented languages
  • Inheritance is to implement the reuse and extension of classes
  • The inherited class is called the base class, or the parent class. Inheriting from the base class is called a derived class, or subclass.
  • In C #, only single inheritance is supported, and subclasses can have only one parent class
  • The parent class has attributes that the child class has, and inheritance can pass
• Example

• 1 usingSystem;2 namespaceObjectfeaturedemo3 {4      Public classRefrigerator5     {6         //encapsulation is the first step in object-oriented programming7         //encapsulate the method, create a class8          Public voidOpen ()9         {TenConsole.WriteLine ("Open"); One         } A          Public voidClose () -         { -Console.WriteLine ("Close"); the         } -  -     } -  +     //If we create a class that does not specify a parent class, the default is inherited from Object -      Public class Person +     { A          Public stringname; at          Public intAge ; -  -          Public voidSay (stringstr) -         { - Console.WriteLine (str); -         } in     } -     //Inheritance-A class can inherit from another class to     //the inherited class is called the parent class, or the base class +     //the inherited class is called a subclass, or a derived class -  the     //inheritance can be extended for functionality and reuse *     //C # only supports single continuation, and a subclass can have only one parent class $      Public classStudent:personPanax Notoginseng     { -          Public intNum//School Number the          Public voidGotoclass () +         { AConsole.WriteLine ("go to class"); the         } +     } -     class Program $     { $         Static voidMain (string[] args) -         { -Refrigerator R =Newrefrigerator (); the             //encapsulation to protect code, data security - R.open ();Wuyi             //encapsulation can mask complexity the  -  Wu             //Inheritance -Person p =NewPerson (); AboutP.name ="Li"; $P.age = -; -P.say ("I am ok!"); -  -Student s =NewStudent (); AS.name ="LiL"; +S.age = A; theS.num =100001; - S.gotoclass (); $         } the     } the}

"Learning notes" C # encapsulation and inheritance