Java tutorial
//package com.java2s; import java.util.Map; public class Main { private static Map<String, Integer> alphaMap; private static int calculateSum(char[] c, byte[] weight) { int res = 0; for (int i = 0; i < c.length; i++) { res += (alphaMap.get(String.valueOf(c[i])) % 10) * weight[i]; } res %= 11; return res; } }