Converting into short and int and long datatype from byte array

This code gives a snippet showing conversion of byte array into short, int and long datatype

//This method converts byte array into short
                  public static short getShort(byte[] array, int offset) {
  return
  ((array[offset] & 0xff) << 8) |
  (array[offset+1] & 0xff);
 }
 //This method converts byte array into itn

 public static int getInt(byte[] array, int offset) {
  return
  ((array[offset]   & 0xff) << 24) |
  ((array[offset+1] & 0xff) << 16) |
  ((array[offset+2] & 0xff) << 8) |
  (array[offset+3] & 0xff);
 }
//This method converts byte array into long

 public static long getLong(byte[] array, int offset) {
  return
  ((long)(array[offset]   & 0xff) << 56) |
  ((long)(array[offset+1] & 0xff) << 48) |
  ((long)(array[offset+2] & 0xff) << 40) |
  ((long)(array[offset+3] & 0xff) << 32) |
  ((long)(array[offset+4] & 0xff) << 24) |
  ((long)(array[offset+5] & 0xff) << 16) |
  ((long)(array[offset+6] & 0xff) << 8) |
  ((long)(array[offset+7] & 0xff));
 }