LeetCode: Excel Sheet Column Number

LeetCode: Excel Sheet Column Number 

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/**
 * Created by hzhou on 4/23/15. [email protected]
 */
public class ExcelSheetColumnNumber {
    public int titleToNumber(String s) {
        assert (s != null && !s.isEmpty());
        char[] chars = s.toCharArray();
        int result = 0;
        for (char aChar : chars) {
            result = result * 26 + getValue(aChar);
        }
        return result;
    }
    private int getValue(char c) {
        return c - 'A' + 1;
    }
}