The difference between static and non-static class

The difference between static and non-static
static:
    the static keyword
    using the class name to call
    in a static method can access static members
    in a static method, can not directly access instance members
    before calling needs initialization (constructor)

non-static:
    no need to use the static keyword
    use cases call the object
    in an instance method can directly access static members
    can access instance members directly in an instance method
    needs to initialize an instance of an object (constructor)

for static class, in class only declares a static member, Instead instance of the class can be declared static class members.

. 1  class Program {
 2      public  static  void the Main ( String [] args) {
 . 3          Person.SayHello ();
 . 4          Animal Animal = new new Animal ();
 . 5          the Console.ReadKey ();
 . 6      }    
 . 7  }
 . 8  static the Person {
 . 9      static the Person () {
 10          Console.WriteLine ( " I is a static class constructor " );
 . 11      }
 12 is      public  static  void the SayHello () {
 13 is         Console.WriteLine ( " I is a static method " );
 14      }
 15  }
 16  class Animal {
 . 17      public Animal () {
 18 is          Console.WriteLine ( " I instantiated class constructor " );
 19      }
 20 }

In the above demo, the definition of a static Person class and non-static Animal class, use static modification in the constructor statically defined in the class directly instantiate this class when calling a static class, static methods static class called directly ( before calling on the initialization, static class constructor is executed only once), instantiate the class constructor call this class directly instantiated.