Difference between revisions of "Instantiation - 2017"

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= Instantiation =
+
== Explanation ==
 +
Instantiation is creating an instance of a class. In simple terms, it's creating a variable. It is said that the variable is an instance of the class.
  
== Explanation ==
+
 
Instantiation is
+
== Skeleton Program Example ==
 +
<syntaxhighlight lang="csharp">
 +
 
 +
//This is the class:
 +
class Simulation
 +
    {
 +
        private Location[,] Landscape;
 +
        private int TimePeriod = 0;
 +
        private int WarrenCount = 0;
 +
        private int FoxCount = 0;
 +
        private bool ShowDetail = false;
 +
        private int LandscapeSize;
 +
        private int Variability;
 +
        private static Random Rnd = new Random();
 +
 
 +
        public Simulation(int LandscapeSize, int InitialWarrenCount, int InitialFoxCount, int Variability, bool FixedInitialLocations)
 +
        {
 +
            int menuOption;
 +
            int x;
 +
            int y;
 +
            string viewRabbits;
 +
            this.LandscapeSize = LandscapeSize;
 +
            this.Variability = Variability;
 +
            Landscape = new Location[LandscapeSize, LandscapeSize];
 +
            CreateLandscapeAndAnimals(InitialWarrenCount, InitialFoxCount, FixedInitialLocations);
 +
            DrawLandscape();
 +
            do
 +
            {
 +
                Console.WriteLine();
 +
                Console.WriteLine("1. Advance to next time period showing detail");
 +
                Console.WriteLine("2. Advance to next time period hiding detail");
 +
                Console.WriteLine("3. Inspect fox");
 +
                Console.WriteLine("4. Inspect warren");
 +
                Console.WriteLine("5. Exit");
 +
                Console.WriteLine();
 +
                Console.Write("Select option: ");
 +
                menuOption = Convert.ToInt32(Console.ReadLine());
 +
                if (menuOption == 1)
 +
                {
 +
                    TimePeriod++;
 +
                    ShowDetail = true;
 +
                    AdvanceTimePeriod();
 +
                }
 +
                if (menuOption == 2)
 +
                {
 +
                    TimePeriod++;
 +
                    ShowDetail = false;
 +
                    AdvanceTimePeriod();
 +
                }
 +
                if (menuOption == 3)
 +
                {
 +
                    x = InputCoordinate('x');
 +
                    y = InputCoordinate('y');
 +
                    if (Landscape[x, y].Fox != null)
 +
                    {
 +
                        Landscape[x, y].Fox.Inspect();
 +
                    }
 +
                }
 +
                if (menuOption == 4)
 +
                {
 +
                    x = InputCoordinate('x');
 +
                    y = InputCoordinate('y');
 +
                    if (Landscape[x, y].Warren != null)
 +
                    {
 +
                        Landscape[x, y].Warren.Inspect();
 +
                        Console.Write("View individual rabbits (y/n)?");
 +
                        viewRabbits = Console.ReadLine();
 +
                        if (viewRabbits == "y")
 +
                        {
 +
                            Landscape[x, y].Warren.ListRabbits();
 +
                        }
 +
                    }
 +
                }
 +
            } while (((WarrenCount > 0) || (FoxCount > 0)) && (menuOption != 5));
 +
            Console.ReadKey();
 +
        }
 +
 
 +
 
 +
 
 +
//And so an instance can be created from anywhere within a program, for example...
 +
 
 +
Simulation Sim;
 +
</syntaxhighlight>

Latest revision as of 14:05, 6 February 2017

Explanation

Instantiation is creating an instance of a class. In simple terms, it's creating a variable. It is said that the variable is an instance of the class.


Skeleton Program Example

//This is the class:
class Simulation
    {
        private Location[,] Landscape;
        private int TimePeriod = 0;
        private int WarrenCount = 0;
        private int FoxCount = 0;
        private bool ShowDetail = false;
        private int LandscapeSize;
        private int Variability;
        private static Random Rnd = new Random();

        public Simulation(int LandscapeSize, int InitialWarrenCount, int InitialFoxCount, int Variability, bool FixedInitialLocations)
        {
            int menuOption;
            int x;
            int y;
            string viewRabbits;
            this.LandscapeSize = LandscapeSize;
            this.Variability = Variability;
            Landscape = new Location[LandscapeSize, LandscapeSize];
            CreateLandscapeAndAnimals(InitialWarrenCount, InitialFoxCount, FixedInitialLocations);
            DrawLandscape();
            do
            {
                Console.WriteLine();
                Console.WriteLine("1. Advance to next time period showing detail");
                Console.WriteLine("2. Advance to next time period hiding detail");
                Console.WriteLine("3. Inspect fox");
                Console.WriteLine("4. Inspect warren");
                Console.WriteLine("5. Exit");
                Console.WriteLine();
                Console.Write("Select option: ");
                menuOption = Convert.ToInt32(Console.ReadLine());
                if (menuOption == 1)
                {
                    TimePeriod++;
                    ShowDetail = true;
                    AdvanceTimePeriod();
                }
                if (menuOption == 2)
                {
                    TimePeriod++;
                    ShowDetail = false;
                    AdvanceTimePeriod();
                }
                if (menuOption == 3)
                {
                    x = InputCoordinate('x');
                    y = InputCoordinate('y');
                    if (Landscape[x, y].Fox != null)
                    {
                        Landscape[x, y].Fox.Inspect();
                    }
                }
                if (menuOption == 4)
                {
                    x = InputCoordinate('x');
                    y = InputCoordinate('y');
                    if (Landscape[x, y].Warren != null)
                    {
                        Landscape[x, y].Warren.Inspect();
                        Console.Write("View individual rabbits (y/n)?");
                        viewRabbits = Console.ReadLine();
                        if (viewRabbits == "y")
                        {
                            Landscape[x, y].Warren.ListRabbits();
                        }
                    }
                }
            } while (((WarrenCount > 0) || (FoxCount > 0)) && (menuOption != 5));
            Console.ReadKey();
        }



//And so an instance can be created from anywhere within a program, for example...

Simulation Sim;