Roman to Integer

public class Solutiion {
public static int romanToInt(String s) {

char[] symbol = { 'I', 'V', 'X', 'L', 'C', 'D', 'M' };
int[] val = { 1, 5, 10, 50, 100, 500, 1000 };
Map<Character, Integer> map = new HashMap<Character, Integer>();
int i, k = 0;
int left, result = 0;
for (i = 0; i < symbol.length; i++) {
map.put(symbol[i], val[i]);
}
left = map.get(s.charAt(0));
result = result + left;
if (s.length() == 1) {
return map.get(s.charAt(0));
}
for (i = 1; i < s.length(); i++) {

if (map.get(s.charAt(i)) <= map.get(s.charAt(i - 1))) {
result = result + map.get(s.charAt(i));
} else {
result = result + map.get(s.charAt(i)) - 2 * map.get(s.charAt(i - 1));
}
}
return result;
}

}