Re: Declaring members for Interfaces

From:
Leonard Milcin <leonard@milcin.dont-spam.pl>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 01 May 2008 17:45:23 +0200
Message-ID:
<4819e593$1@news.home.net.pl>
Wojtek wrote:

Todd wrote :

public enum NonOrdinal
{
    RADIUS( 21 ),
    DIAMETER( 42 );


     private double value;

     private NonOrdinal( double value )

    {
        this.value = value;
    }

    public double getValue()
    {
        return value;
    }


     public NonOrdinal getNonOrdinal(double value) throws
EnumNotFoundException
     {
        for (NonOrdinal ord : NonOrdinal.values())
          if ( ord.getValue == value )
            return ord;

        throw new EnumNotFoundException("NonOrdinal not found: " + value);
     }


OMG! I won't even comment. This is just silly... don't teach people if
you can't solve problems by yourself.

If you really, really need such a mechanism, try this:

public enum Test {

    A1( 1 ),
    A2( 2 );

    private final Integer value;

    private static final Map<Integer, Test> byValue;

    static {
        byValue = new HashMap<Integer,Test>();
        for (Test t : Test.values()) {
            byValue.put(t.value, t);
        }
    }

    private Test(Integer value) {
        this.value = value;
    }

    private Integer getValue() {
        return value;
    }

    public static Test getByValue(Integer value) {
        return byValue.get(value);
    }

}

Regards,
Leonard

--
Simplicity is the ultimate sophistication.
                                  -- Leonardo da Vinci

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