C#构造函数

using System;

namespace LineApplication {

   class Line {
      private double length;   // Length of a line

      public Line() {
         Console.WriteLine("Object is being created");
      }

      public void setLength( double len ) {
         length = len;
      }

      public double getLength() {
         return length;
      }

      static void Main(string[] args) {
         Line line = new Line();    

         // set line length
         line.setLength(6.0);
         Console.WriteLine("Length of line : {0}", line.getLength());
         Console.ReadKey();
      }
   }
}