C # learning notes-interfaces and abstract classes,

C # learning notes-interfaces and abstract classes,

  1 namespace ClassLesson  2 {  3     class Program  4     {  5         static void Main(string[] args)  6         {  7             var person = new Person(5);  8             Console.WriteLine(person.GetAge());  9             Console.WriteLine(Person.getFive());        //static 10             Console.WriteLine(person.Age); 11             person.Age = 10; 12             Console.WriteLine(person.Age); 13             Console.WriteLine(person.Age2); 14             person.Age2 = 10; 15             Console.WriteLine(person.GetAge()); 16             Console.WriteLine(person.GetName()); 17  18             Console.ReadLine(); 19         } 20     } 21  22  23     //the default modifier is internal，can be accessed in the namespace 24     //the Class can only inherit one Class，but can inherit a great deal of Interface 25     class Person : Main, ISuper 26     { 27         int age; 28  29         public int Age      //default value is 0 30         { 31             get; 32             set; 33         } 34  35         public int Age2 36         { 37             get 38             { 39                 return age + 10; 40             } 41             set 42             { 43                 age = value - 10; 44             } 45         } 46  47         public Person(int myAge)        //constructed function 48         { 49             this.age = myAge; 50         } 51  52         public int GetAge()     //the default modifier is private (in the Class) 53         { 54             return age; 55         } 56  57         public static int getFive()     //static method be stored in the Class 58         { 59             return 5; 60         } 61  62         public int GetSuper() 63         { 64             return age = 100; 65         } 66  67         public override int GetAbstract() 68         { 69             return 50; 70         } 71     } 72  73     interface ISuper     //only include method、property、index and event 74     { 75         int GetSuper();     //only need statement,the details in the Class 76     } 77  78     //abstract class=>can't be instantiated 79     //function:be inherited by other Class 80     abstract class Main 81     { 82         public string Name; 83         public string GetName() 84         { 85             return Name = "string"; 86         } 87  88         public abstract int GetAbstract();   //abstract method's details must be in the Class which inherited this 89     } 90  91     /** 92      * the difference between Abstract Class and Interface: 93      * 1. 94      * Internal:all details be in the Class which inherited it 95      * Abstract Class:only 'abstract' details be in the Class which inherited it 96      * 2. 97      * Internal:can't have member variables and properties 98      * Abstract Class:all 99      * 3.100      * Abstract Class:can't be instantiated101      * 102      * the Class can only inherit one Class，but can inherit a great deal of Interface103      */104 }