ByteArrayUtil { public static int compareRegion(byte[] array1, int startIdx1, byte[] array2, int startIdx2, int length) { int result = 0; for (int i = 0; result == 0 && i < length; i++) { result = (array1[startIdx1 + i] & 0xff) - (array2[startIdx2 + i] & 0xff); } return result; }  static void put(byte[] source, byte[] target, int offset); static byte[] get(byte[] array, int offset); static byte[] get(byte[] array, int offset, int length); static void putInt(int value, byte[] array, int offset); static int getInt(byte[] array, int offset); static void putLong(long value, byte[] array, int offset); static long getLong(byte[] array, int offset); static int find(byte[] a, int fromIndex, int toIndex, byte key); static int find(byte[] a, int fromIndex, int toIndex, byte[] key); static boolean matchesPattern(byte[] value, byte[] mask, byte[] pattern); static boolean regionMatches(byte[] subValue, byte[] superValue, int offset); static int compareRegion(byte[] array1, int startIdx1, byte[] array2, int startIdx2, int length); static BitSet toBitSet(byte[] array); static byte[] toByteArray(BitSet bitSet); static String toHexString(byte[] array);  }
@Test public void testCompareRegion() { assertEquals(0, ByteArrayUtil.compareRegion(new byte[] {}, 0, new byte[] {}, 0, 0)); assertEquals(0, ByteArrayUtil.compareRegion(new byte[] { 0, 2 }, 0, new byte[] { 0, 1 }, 0, 1)); assertEquals(-1, ByteArrayUtil.compareRegion(new byte[] { 0, 0 }, 0, new byte[] { 0, 1 }, 0, 2)); assertEquals(1, ByteArrayUtil.compareRegion(new byte[] { 0, 2 }, 0, new byte[] { 0, 1 }, 0, 2)); }