Java vs. C#

enum

Java
 
Java 5 has enum type. But version below Java 5, 
there is no enum type. You may use array or class to 
work like an enum type in C#.
class Color 
{
    public static int Red = 1;
    public static int Blue = 2;
    public static int Green = 3;
}
class Shape
{
    public void Fill(Color color) {
        switch(color) {
            case color.Red:
                ...
                break;
            case color.Blue:
                ...
                break;
            case color.Green:
                ...
                break;
            default:
                break;
        }
    }
}


You may use class or array to 
replace enum in C#
public class EnumTest {
   public static void main(String[] args) {
      String[] DAYS = {"Sunday","Monday","Tuesday",
                       "Wednesday","Thursday",
                       "Friday","Saturday"};
       
      for(int i = 0; i < DAYS.length; i++){
           System.out.println("Number "+i+
                   " of EnumTest.DAYS is "+DAYS[i]); 
      }
   }
}

The output:
Number 0 of EnumTest.DAYS is Sunday
Number 1 of EnumTest.DAYS is Monday
Number 2 of EnumTest.DAYS is Tuesday
Number 3 of EnumTest.DAYS is Wednesday
Number 4 of EnumTest.DAYS is Thursday
Number 5 of EnumTest.DAYS is Friday
Number 6 of EnumTest.DAYS is Saturday 


public class Direction {
    public final static int NORTH = 1;
    public final static int EAST = 2;
    public final static int WEST = 3;
    public final static int SOUTH = 4;
}

Usage:

int wall = Direction.NORTH;

C#
 
An enum type is a user defined value type.
It is used for "multiple choice" scenarios.
It contains constants.
enum Color 
{
    Red,
    Blue,
    Green
}
class Shape
{
    public void Fill(Color color) {
        switch(color) {
            case Color.Red:
                ...
                break;
            case Color.Blue:
                ...
                break;
            case Color.Green:
                ...
                break;
            default:
                break;
        }
    }
}


using System;
public class EnumTest
{
    public enum DAYS: byte {
                 Monday, Tuesday, Wednesday, Thursday, 
                 Friday, Saturday, Sunday}
    public static void Main()
    {
        Array dayArray = Enum.GetValues(typeof(EnumTest.DAYS));
        foreach (DAYS day in dayArray)
           Console.WriteLine("Number {1} of EnumTest.DAYS is {0}", 
                                          day, day.ToString("d")); 

    }
}
The output:
Number 0 of EnumTest.DAYS is Sunday
Number 1 of EnumTest.DAYS is Monday
Number 2 of EnumTest.DAYS is Tuesday
Number 3 of EnumTest.DAYS is Wednesday
Number 4 of EnumTest.DAYS is Thursday
Number 5 of EnumTest.DAYS is Friday
Number 6 of EnumTest.DAYS is Saturday 


public enum Direction { 
        North, 
        East, 
        West, 
        South
};

Usage:

Direction wall = Direction.North;