### Question:
CodecUtils { public static int bytesToInt(byte[] ary) { return (ary[3] & 0xFF) | ((ary[2] << 8) & 0xFF00) | ((ary[1] << 16) & 0xFF0000) | ((ary[0] << 24) & 0xFF000000); }  static byte[] intToBytes(int num); static int bytesToInt(byte[] ary); static byte[] short2bytes(short num); static byte[] copyOf(byte[] src, int length); static byte[] parseHigh4Low4Bytes(byte b); static byte buildHigh4Low4Bytes(byte high4, byte low4); static byte[] parseHigh2Low6Bytes(byte b); static byte buildHigh2Low6Bytes(byte high2, byte low6); static String byteToBits(byte b); static byte bitsToByte(String bits); static boolean startsWith(byte[] bs, byte[] head); static boolean[] byte2Booleans(byte b); static byte booleansToByte(boolean[] array); static String byte2hex(byte[] bytes); static byte[] hex2byte(String str); static boolean getBooleanFromByte(byte modifiers, int i); static byte setBooleanToByte(byte modifiers, int i, boolean bool); static void flatCopyTo(String prefix, Map<String, Object> sourceMap,
                                  Map<String, String> dstMap); static void treeCopyTo(String prefix, Map<String, String> sourceMap,
                                  Map<String, String> dstMap, boolean remove); static final Object[] EMPTY_OBJECT_ARRAY; static final Class<?>[] EMPTY_CLASS_ARRAY; }### Answer:
@Test public void bytesToInt() { int i = CodecUtils.bytesToInt(new byte[] { 0, 0, 0, 0 }); Assert.assertEquals(0, i); i = CodecUtils.bytesToInt(new byte[] { 0, 0, 3, -24 }); Assert.assertEquals(1000, i); int s = CodecUtils.bytesToInt(new byte[] { 1, 0, 0, 2 }); Assert.assertEquals(s, 16777218); }