### Question:
ConvertUtils { public static String fromHexToString(final String hexString) { if (hexString == null) { return null; } return StringEncoder.getString(fromHexToBytes(hexString)); } private  ConvertUtils(); static byte[] getBytes(final String hexString); static String toHex(final byte[] bytes); static String padHex(final String hex, int hexStringSize); static byte[] fromHexToBytes(String hexString); static Pair<String, Integer> xorValues(String originalValue, String newValue); static String fromHexToString(final String hexString); static String fromStringToHex(final String plainText); static String toSize16Hex(final BigInteger number); static void validateNotNegative(final BigInteger number); static void validateNotNegative(final long number); static String toString(final BigInteger number); static BigInteger toUnsignedBigInteger(long value); static BigInteger toUnsignedBigInteger(BigInteger value); static boolean isHexString(String input); static void validateIsHexString(String input); static void validateIsHexString(String input, Integer size); static String reverseHexString(String hex); static byte[] xor(byte[] b1, byte[] b2);  }### Answer:
@Test void fromHex() { String message = "This is the message for this account! 汉字89664"; Assertions.assertEquals( message, ConvertUtils.fromHexToString( "5468697320697320746865206D65737361676520666F722074686973206163636F756E742120E6B189E5AD973839363634")); }