How to Convert Arrays to Sets in Java?

Converting Arrays to Sets in Java

Converting arrays to sets in Java can be achieved using various approaches. While using loops is a straightforward method, it may be desirable to employ a more concise solution.

One efficient way to accomplish this task is by utilizing the Arrays.asList method. However, asList returns a list, which is incompatible with sets. To convert the list to a set, we can employ new HashSet. Here's an example:

<code class="java">Set<T> mySet = new HashSet<>(Arrays.asList(someArray));</code>

In Java 9 and above, you can create an unmodifiable set using Set.of:

<code class="java">Set<T> mySet = Set.of(someArray);</code>

Java 10 onwards offers type inference for generic parameters, allowing you to simplify the code:

<code class="java">var mySet = Set.of(someArray);</code>

Caution:

Set.of raises an IllegalArgumentException if there are duplicate elements in the array. For such cases, use Set.copyOf:

<code class="java">var mySet = Set.copyOf(Arrays.asList(array));</code>

This approach ensures the creation of an unmodifiable set while accommodating duplicate elements in the array.

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