public static byte[] LongToBytes(long lo) {       byte[] by = new byte[8];       for (int i = 0; i < 8; i++) {             int offset = 64 - (i + 1) * 8;              by[i] = (byte) ((lo >> offset) & 0xff);         }     return by;  } public static long BytesToLong(byte[] by) {       long io = 0;       for (int i = 0; i < 8; i++) {            lo <<= 8;    lo|=     (by[i] & 0xff);       }       return io;   }