How to Convert an Array to a Set in Java: Efficient Techniques and Best Practices

Converting an Array to a Set in Java

Converting an array to a Set in Java is a common task. One way to achieve this is through a loop, but there are more efficient and concise methods.

How to Convert an Array to a Set

Use the Arrays.asList() Method

Similar to the Arrays.asList() method for converting arrays to lists, there is no direct equivalent for creating Sets. However, you can use Arrays.asList() to create a List, and then convert the List to a Set using the Set constructor:

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

Use the Set.of() Method (Java 9 )

If you only need an unmodifiable Set, you can use the Set.of() method introduced in Java 9:

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

Use Generic Type Inference (Java 10 )

In Java 10 , the generic type parameter can be inferred from the array's component type:

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

Caution:

Set.of() throws an IllegalArgumentException if the array contains duplicate elements. To handle this, create an unmodifiable Set using the Arrays.asList() method and Set.copyOf():

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

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