Java - easily convert array to set

Question

Hey,

I'd like to convert an array to a set in Java. There are some obvious ways of doing this (i.e. with a loop) but I would like something a bit neater, something like:

java.util.Arrays.asList(Object[] a);

Any ideas?

Cheers,

Pete

Answer 1

After you do Arrays.List(array) you can execute Set set = new HashSet(list);

Here is a sample method, you can write:

public <T> Set<T> GetSetFromArray(T[] array) {
    return new HashSet<T>(Arrays.asList(array));
}

Answer 2

Like this:

Set<T> mySet = new HashSet<T>(Arrays.asList<T>(someArray));

Answer 3

new HashSet<Object>(Arrays.asList(Object[] a));

But I think this would be more efficient:

final Set s = new HashSet<Object>();
for (Object o : a) { s.add(o); }

Answer 4

With Guava you can do:

T[] array = ...
Set<T> set = Sets.newHashSet(array);

Answer 5

Set<T> mySet = new HashSet<T>();
Collections.addAll(mySet, myArray);

That's Collections.addAll(java.util.Collection, T...) from jdk1.6.