CodecUtils { public static boolean getBooleanFromByte(byte modifiers, int i) { if (i > 7 || i < 0) { throw new IllegalArgumentException("Index must between 0-7!"); } return ((modifiers >> i) & 0x01) == 1; }  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; }
@Test public void getBooleanFromByte() { byte b = 0x35; Assert.assertTrue(CodecUtils.getBooleanFromByte(b, 0)); Assert.assertFalse(CodecUtils.getBooleanFromByte(b, 1)); Assert.assertTrue(CodecUtils.getBooleanFromByte(b, 2)); Assert.assertFalse(CodecUtils.getBooleanFromByte(b, 3)); Assert.assertTrue(CodecUtils.getBooleanFromByte(b, 4)); Assert.assertTrue(CodecUtils.getBooleanFromByte(b, 5)); Assert.assertFalse(CodecUtils.getBooleanFromByte(b, 6)); Assert.assertFalse(CodecUtils.getBooleanFromByte(b, 7)); boolean ok = true; try { Assert.assertFalse(CodecUtils.getBooleanFromByte(b, -1)); } catch (Exception e) { ok = false; } Assert.assertFalse(ok); ok = true; try { Assert.assertFalse(CodecUtils.getBooleanFromByte(b, 8)); } catch (Exception e) { ok = false; } Assert.assertFalse(ok); }