How to Convert an Array to a Set in Java?

Converting Arrays to Sets in Java

Converting an array to a Set in Java involves transferring elements from the array to a set data structure that offers distinct values. While a basic loop-based approach is viable, a more streamlined method is preferred.

Solution

To achieve this efficiently, utilize the following code:

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

This code creates a new HashSet and populates it with elements from the input array, someArray, resulting in a Set with unique values.

Java 9 Enhancements

For Java 9 and later, a shorter syntax is available for creating unmodifiable sets:

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

Java 10 Advancements

From Java 10 onwards, type inference simplifies the syntax further:

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

Important Considerations

When using Set.of, be aware that duplicate elements in someArray can trigger an IllegalArgumentException. To handle duplicates while creating an unmodifiable set, use the following code:

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

By leveraging these techniques, you can effortlessly convert arrays to Sets in Java, ensuring uniqueness and maximizing code efficiency.

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