ByteArrayUtil { public static byte[] get(byte[] array, int offset) { return get(array, offset, array.length - offset); }  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 testGet() { assertArrayEquals(new byte[] {}, ByteArrayUtil.get(new byte[] {}, 0)); assertArrayEquals(new byte[] { 3, 4 }, ByteArrayUtil.get(new byte[] { 1, 2, 3, 4 }, 2)); assertArrayEquals(new byte[] { 3, 4, 5 }, ByteArrayUtil.get(new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }, 2, 3)); assertArrayEquals(new byte[] {}, ByteArrayUtil.get(new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }, 2, 0)); }