Re: How to store an enum value as a corresponding integer?

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 12 Feb 2011 13:44:51 -0500
Message-ID:
<ij6kde$58s$1@news.albasani.net>
Robin Wenger allegedly wrote:

Internally in a class I would like to store a value as integer value.
From outside of the class this value should be accessible as enumeration.

I am thinking about something like:

pubic class mycontainer {
   ....
   private int myvalue;
   public enum weekday { monday, tuesday, wednesday };

   public weekday getcurrentweekday() {
       return(positioninlist(myvalue)); }

   public void setcurrentweekday(weekday) {
        myvalue=positioninlist(weekday);
        }
   }

In the sample above 1 should be assigned to myvalue if monday is set as
weekday:

mycontainer.setcurrentweekday(mycontainer.weekday.monday);

However the core function positioninlist() is not available.

How can I achive this otherwise in detail?


Daniele Futtorovic wrote:

Many things wrong with your approach and your naming, as Eric pointed out.
Not to repeat what he said, please consider that you can also do the following:

public enum DayOfWeek {

  MONDAY(42),
  TUESDAY(43),
  WEDNESDAY(44),
  ...

  ;

  final int dayIndex;
  DayOfWeek( int dayindex ){
    this.dayIndex = dayindex;
  }

  public int getDayIndex(){
    return dayIndex;
  }
}


Yeah, or use 'ordinal()'

But surely early on the OP immediately rushed to read
  http://download.oracle.com/javase/6/docs/api/java/lang/Enum.html
first thing, and thus already knows of this method, of course!

Either way, reliance on a number instead of a typed, compiler-enforced value
carries costs.

--
Lew
Honi soit qui mal y pense.

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