Question

I just asked a similar question, but then I realized I actually need something else. Since that question already has two answers, I do not want to edit my question. So here is what I actually need:

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I want to detect whether a subrange of an array contains null references only. Somehow like this:

public static <T> boolean nullReferencesOnly
(T[] array, int fromInclusive, int toExclusive)
{
    for (int i = fromInclusive; i < toExclusive; ++i)
    {
        if (array[i] != null) return false;
    }
    return true;
}

Is there a method like this in the Java library so I don’t have to manually loop over the array?

Answer 1

Collections.frequency(Arrays.asList(array), null) == array.length

For a range, SLaks has already suggested .subList(from, to) in his answer.