java - EnumSet from array, shortest variant? -


i need enumset array (which given through varargs method parameter). first, surprised there no varargs constructor method in enumset (there enumset#of(e first, e... rest)). workaround, used following variant:

enumset<options> temp = enumset.copyof(arrays.aslist(options));

however, triggers java.lang.illegalargumentexception: collection empty. so, ended following, looks ridiculous:

enumset<options> temp = options.length > 0 ?                          enumset.copyof(arrays.aslist(options)) :                          enumset.noneof(options.class);

if course moved utility method, still, i'm asking myself if there simpler way using existing methods?

this 2 lines, less complex:

    enumset<options> temp = enumset.noneof(options.class); // make empty enumset     temp.addall(arrays.aslist(options)); // add varargs

i don't consider worse other kind of variable declaration class doesn't have constructor want:

    someclass variable = new someclass(); // make empty object     variable.addstuff(stuff); // add stuff

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