Excel Sheet Column Number (Java)

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1    B -> 2    C -> 3    ...    Z -> 26    AA -> 27    AB -> 28 

Source

public class Solution {    public int titleToNumber(String s) {        int i,num = 0;        i = 0;                        while( i <  s.length()){        if(s.charAt(i) != 'Z'){        num = num * 26 + s.charAt(i) - 65 + 1;        }        else num = num * 26 + 26;        i++;        }    return num;    }}

Test

    public static void main(String[] args){    System.out.println(new Solution().titleToNumber("AA"));    }