Spliterator

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@Override
public Spliterator<E> spliterator() {
    return new ArrayListSpliterator(0, -1, 0);
}

Index-based split-by-two, lazily initialized Spliterator
final class ArrayListSpliterator implements Spliterator<E> {
    private int index; // current index, modified on advance/split
    private int fence; // -1 until used; then one past last index
    private int expectedModCount; // initialized when fence set

Creates new spliterator covering the given range.
 ArrayListSpliterator(int origin, int fence, int expectedModCount) {
        this.index = origin;
        this.fence = fence;
        this.expectedModCount = expectedModCount;
    }