### Question:
Numeric { public static String littleEndian(long number) { byte[] bytes = Numeric.toBytesPadded(BigInteger.valueOf(number), 8); for (int i = 0; i < bytes.length / 2; i++) { byte temp = bytes[i]; bytes[i] = bytes[bytes.length - 1 - i]; bytes[bytes.length - 1 - i] = temp; } return toHexString(bytes); } private  Numeric(); static String encodeQuantity(BigInteger value); static BigInteger decodeQuantity(String value); static String cleanHexPrefix(String input); static String prependHexPrefix(String input); static boolean containsHexPrefix(String input); static BigInteger toBigInt(byte[] value, int offset, int length); static BigInteger toBigInt(byte[] value); static BigInteger toBigInt(String hexValue); static BigInteger toBigIntNoPrefix(String hexValue); static String toHexStringWithPrefix(BigInteger value); static String toHexStringNoPrefix(BigInteger value); static String toHexStringNoPrefix(byte[] input); static String toHexStringWithPrefixZeroPadded(BigInteger value, int size); static String toHexStringNoPrefixZeroPadded(BigInteger value, int size); static byte[] toBytesPadded(BigInteger value, int length); static String littleEndian(long number); static byte[] hexStringToByteArray(String input); static String toHexString(byte[] input, int offset, int length, boolean withPrefix); static String toHexString(byte[] input); static String toHexString(String input); static byte asByte(int m, int n); static boolean isIntegerValue(BigDecimal value); static boolean isIntegerValue(String value); static List<Byte> intToBytes(int value);  }### Answer:
@Test public void testLittleEndian() { String littleEndian = Numeric.littleEndian(71); Assertions.assertEquals("0x4700000000000000", littleEndian); }