EnumSet from array, shortest variant?
Just an alternative. Same amount of code, except no need converting to list, using EnumSet.of() :
EnumSet<Options> temp = options.length > 0 ? EnumSet.of(options[0], options) : EnumSet.noneOf(Options.class);No worries that first element is repeated(it won't be duplicated in a set anyway), no performance gain or penalties as well.
This is two lines, but slightly less complex:
EnumSet<Options> temp = EnumSet.noneOf(Options.class); // make an empty enumsettemp.addAll(Arrays.asList(options)); // add varargs to itI don't consider this worse than any other kind of variable declaration for a class which doesn't have the constructor you want:
SomeClass variable = new SomeClass(); // make an empty object variable.addStuff(stuff); // add stuff to it
Guava has factory methods for these kinds of situations:It still needs the call to Arrays.asList but at least it's readable.
import com.google.common.collect.Sets;EnumSet<Options> temp = Sets.newEnumSet(Arrays.asList(options), Options.class);