How to convert an Array to a Set in Java

Like this:

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

In Java 9+, if unmodifiable set is ok:

Set<T> mySet = Set.of(someArray);

In Java 10+, the generic type parameter can be inferred from the arrays component type:

var mySet = Set.of(someArray);

java collections arrays set

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

Additionally: what if our array is full of primitives?

For JDK < 8, I would just write the obvious for loop to do the wrap and add-to-set in one pass.

For JDK >= 8, an attractive option is something like:

Arrays.stream(intArray).boxed().collect(Collectors.toSet());

java collections arrays set

With Guava you can do:

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

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