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Because a copy of the array is returned, the original array values (the references to the String objects) cannot be modified by a client. Note that a manual deep copy could be required when dealing with arrays of objects. This generally happens when the objects do not export a clone() method (see OBJ06-J. Defensively copy mutable inputs and mutable internal components for more information).
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This compliant solution constructs a public immutable list from the private array. It is safe to share immutable objects without risk that the recipient can modify them [Mettler 2010]. This example is safe because String is immutable.
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private static final String[] items = { ... };
public static final List<String> itemsList =
Collections.unmodifiableList(Arrays.asList(items));
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