// put an int into a byte array
   int n= 0x01020304; // easyto test if set out in hex
   byte[] bytes = new byte[4];
   bytes[3]=(byte) n; // lowest 8 bits into byte[3]
   n>>=8; // this is n = n >> 8. The >> is a bit shift to the right 8 places
   // so it loses the lower 8 bits, and shifts the rest along
   bytes[2]=(byte) n; // this now gets what was the second lowest 8 bits
    n>>=8;
   bytes[1]=(byte) n; // this would be better as a loop
    n>>=8;
   bytes[0]=(byte) n;
   for (int i=0; i<4; i++)
     System.out.println(bytes[i]); // 1 2 3 4