private static Stream<Object> flatten(Object[] array) { return Arrays.stream(array) .flatMap(o -> o instanceof Object[]? flatten((Object[])o): Stream.of(o)); }
Object[] array = { 1, 2, new Object[]{ 3, 4, new Object[]{ 5 }, 6, 7 }, 8, 9, 10 }; System.out.println("original: "+Arrays.deepToString(array)); Object[] flat = flatten(array).toArray(); System.out.println("flat: "+Arrays.toString(flat));
int[] flatInt = flatten(array).mapToInt(Integer.class::cast).toArray(); System.out.println("flat int: "+Arrays.toString(flatInt));