# Re: How do I convert an int to an enum?

From:
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 18 Sep 2006 13:29:41 +0200
Message-ID:
<4n7e95F900kuU1@individual.net>
On 18.09.2006 12:32, qu0ll wrote:

"Michael Rauscher" <michlmann@gmx.de> wrote in message
news:eelr7q\$2p8q\$1@registered.motzarella.org...

qu0ll schrieb:

Is this the way to do it? Now to convert all I do is:

ReturnValue x = ReturnValue.convert(method());

But this seems silly to have to define the int values of each enum value
effectively twice. Is there a better (simpler) way?

public static ReturnValue convert( int value ) {
ReturnValue result = null; // or: = ReturnValue.UNDEFINED
ReturnValue values[] = ReturnValue.values();
int i = 0;
while ( i < values.length && result == null )
if ( values[i].value == value )
result = values[i];
else
i++;

return result;
}

Bye
Michael

Thanks, that's a neat solution. I didn't realise there was a values()
method.

IMHO there are neater solutions:

package enums;

public enum ReturnValue {

POSITIVE, NEGATIVE, EITHER, UNDEFINED;

public static ReturnValue convert1( int i ) {
for ( ReturnValue current : values() ) {
if ( current.ordinal() == i ) {
return current;
}
}

return UNDEFINED;
}

public static ReturnValue convert2( int i ) {
return values()[i];
}

public static ReturnValue convert3( int i ) {
try {
return values()[i];
} catch ( ArrayIndexOutOfBoundsException e ) {
return UNDEFINED;
}
}

public static ReturnValue convert4( int i ) {
final ReturnValue[] v = values();
return i >= 0 && i < v.length ? v[i] : UNDEFINED;
}
}

- no explicit int needed, enum comes with ordinal() already
- less complex conversion

Kind regards

robert

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