Illustrates how to declare classes, object references, and create objects : Class Definition : Class Interface C# Source Code

    

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example5_1.cs illustrates how to declare
  classes, object references, and create objects
*/


// declare the Car class
class Car
{

  // declare the fields
  public string make;
  public string model;
  public string color;
  public int yearBuilt;

  // define the methods
  public void Start()
  {
    System.Console.WriteLine(model + " started");
  }

  public void Stop()
  {
    System.Console.WriteLine(model + " stopped");
  }

}


public class Example5_1
{

  public static void Main()
  {

    // declare a Car object reference named myCar
    Car myCar;

    // create a Car object, and assign its address to myCar
    System.Console.WriteLine("Creating a Car object and assigning " +
      "its memory location to myCar");
    myCar = new Car();

    // assign values to the Car object's fields using myCar
    myCar.make = "Toyota";
    myCar.model = "MR2";
    myCar.color = "black";
    myCar.yearBuilt = 1995;

    // display the field values using myCar
    System.Console.WriteLine("myCar details:");
    System.Console.WriteLine("myCar.make = " + myCar.make);
    System.Console.WriteLine("myCar.model = " + myCar.model);
    System.Console.WriteLine("myCar.color = " + myCar.color);
    System.Console.WriteLine("myCar.yearBuilt = " + myCar.yearBuilt);

    // call the methods using myCar
    myCar.Start();
    myCar.Stop();

    // declare another Car object reference and
    // create another Car object
    System.Console.WriteLine("Creating another Car object and " +
      "assigning its memory location to redPorsche");
    Car redPorsche = new Car();
    redPorsche.make = "Porsche";
    redPorsche.model = "Boxster";
    redPorsche.color = "red";
    redPorsche.yearBuilt = 2000;
    System.Console.WriteLine("redPorsche is a " + redPorsche.model);

    // change the object referenced by the myCar object reference
    // to the object referenced by redPorshe
    System.Console.WriteLine("Assigning redPorsche to myCar");
    myCar = redPorsche;
    System.Console.WriteLine("myCar details:");
    System.Console.WriteLine("myCar.make = " + myCar.make);
    System.Console.WriteLine("myCar.model = " + myCar.model);
    System.Console.WriteLine("myCar.color = " + myCar.color);
    System.Console.WriteLine("myCar.yearBuilt = " + myCar.yearBuilt);

    // assign null to myCar (myCar will no longer reference an object)
    myCar = null;

  }

}