### Question:
RoaringInspection { public static short[] intToShortKeys(int[] ukeys) { short[] keys = new short[ukeys.length]; for (int i = 0; i < keys.length; i++) { keys[i] = Util.lowbits(ukeys[i]); } return keys; } private  RoaringInspection(); static RoaringBitmap[] split(RoaringBitmap bitmap); static RoaringBitmap join(RoaringBitmap[] split); static RoaringBitmap[] extract(RoaringBitmap bitmap, int[] ukeys); static long sizeInBits(RoaringBitmap bitmap); static void cardinalityInBuckets(RoaringBitmap bitmap, int[][] indexes, long[][] buckets); static int key(int position); static int[] keys(RoaringBitmap bitmap); static int[] keysNotEqual(RoaringBitmap x1, RoaringBitmap x2); static int[] userialize(RoaringBitmap bitmap, DataOutput[] outContainers); static boolean[] userializeAtomized(RoaringBitmap index, int[] ukeys, DataOutput[] dataOutputs); static short[] serialize(RoaringBitmap bitmap, DataOutput[] outContainers); static long[] serializeSizeInBytes(RoaringBitmap bitmap, int[] ukeys); static boolean udeserialize(BitmapAndLastId<RoaringBitmap> result, StreamAtoms streamAtoms); static int lastSetBit(int ukey, DataInput inContainer); static void optimize(RoaringBitmap bitmap, int[] ukeys); static short intToShortKey(int ukey); static short[] intToShortKeys(int[] ukeys); static int shortToIntKey(short key); static int[] shortToIntKeys(short[] keys); static int containerCount(RoaringBitmap bitmap); static int naiveFirstIntersectingBit(RoaringBitmap x1, RoaringBitmap x2); static int firstIntersectingBit(RoaringBitmap x1, RoaringBitmap x2);  }### Answer:
@Test public void testIntToShortKeys() throws Exception { int[] ukeys = new int[65_536]; for (int i = 0; i < ukeys.length; i++) { ukeys[i] = i; } short[] keys = RoaringInspection.intToShortKeys(ukeys); int[] got = RoaringInspection.shortToIntKeys(keys); Assert.assertEquals(got, ukeys); }