Java tutorial
//package com.java2s; public class Main { public static int byte2Int(byte b) { int ii = 0; int temp = 0x01; if (b >= 0) return (int) b; for (int i = 0; i < 8; i++) { if ((b & (temp << i)) != 0) { ii += Math.pow(2, i); } } return ii; } }