D语言静态

import std.stdio;

class Box { 
   public: 
      static int objectCount = 0;

      // Constructor deFinition 
      this(double l = 2.0, double b = 2.0, double h = 2.0) { 
         writeln(Constructor called.); 
         length = l; 
         breadth = b; 
         height = h; 

         // Increase every time object is created
         objectCount++; 
      } 

      double Volume() { 
         return length * breadth * height; 
      }

   private: 
      double length;     // Length of a Box 
      double breadth;    // Breadth of a Box 
      double height;     // Height of a Box 
};

void main() { 
   Box Box1 = new Box(3.3, 1.2, 1.5);    // Declare Box1 
   Box Box2 = new Box(8.5, 6.0, 2.0);    // Declare Box2  

   // Print total number of objects. 
   writeln(Total objects: ,Box.objectCount);  
}