### Question:
Utils { public static String bytesToHex(byte[] bytes) { char[] hexChars = new char[bytes.length * 2]; for (int j = 0; j < bytes.length; j++) { int v = bytes[j] & 0xFF; hexChars[j * 2] = HEX_ARRAY[v >>> 4]; hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F]; } return new String(hexChars); } private  Utils(); static String bytesToHex(byte[] bytes); static UUID uuidFromInteger(int value);  }### Answer:
@Test public void bytesToHex() { byte[] bytes = new byte[] {0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xAB, (byte) 0xCD, (byte) 0xEF}; assertEquals("0123456789abcdef", Utils.bytesToHex(bytes)); }