C# Language Specification - Willy .Net

Chapter 8 Language Overviewclass Test{static void Main() {Stack s = new Stack();s.Push(1);s.Push(2);s.Push(3);s[0] = 33; // Changes the top item from 3 to 33s[1] = 22; // Changes the middle item from 2 to 22s[2] = 11; // Changes the bottom item from 1 to 11}}shows an indexer for the Stack class.8.7.8 Instance constructorsAn instance constructor is a member that implements the actions required to initialize an instance of a class.The exampleusing System;class Point{public double x, y;}public Point() {this.x = 0;this.y = 0;}public Point(double x, double y) {this.x = x;this.y = y;}public static double Distance(Point a, Point b) {double xdiff = a.x - b.x;double ydiff = a.y - b.y;return Math.Sqrt(xdiff * xdiff + ydiff * ydiff);}public override string ToString() {return string.Format("({0}, {1})", x, y);}class Test{static void Main() {Point a = new Point();Point b = new Point(3, 4);double d = Point.Distance(a, b);Console.WriteLine("Distance from {0} to {1} is {2}", a, b, d);}}shows a Point class that provides two public instance constructors, one of which takes no arguments, whilethe other takes two double arguments.If no instance constructor is supplied for a class, then an empty one with no parameters is automaticallyprovided.8.7.9 DestructorsA destructor is a member that implements the actions required to destruct an instance of a class. Destructorscannot have parameters, they cannot have accessibility modifiers, and they cannot be called explicitly. Thedestructor for an instance is called automatically during garbage collection.39