The ordinal() method on the enum returns the constant. In other words, you can assume this to be the same as index and similar to arrays the index starts with zero(0).

Code snippet:

public class EnumOrdinal{   public static void main(String args[])   {      EnumOrdinal enumOrdinal = new EnumOrdinal();      enumOrdinal.proceed();   }      enum Days {      SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY;   }      private void proceed()   {      Days ordinalDay = Days.FRIDAY; //Change this value to one of the values in the enum Days to get the respective ordinal      System.out.println("Ordinal of " + ordinalDay + " is " + ordinalDay.ordinal());   }}/*Expected output: Ordinal of FRIDAY is 5*/