New to coding, this is the easy way I can think of, and I don't know how to improve this solution.

```
public int romanToInt(String s){
int num = 0;
int plus = 0;
int minus = 0;
String roman = "IVXLCDM";
int[] nums = {1,5,10,50,100,500,1000};
for (int i = 0; i < s.length() - 1; i++){
int index1 = roman.indexOf(s.charAt(i));
int index2 = roman.indexOf(s.charAt(i + 1));
if (index1 < index2) {
minus = minus + nums[index1];
} else {
plus = plus + nums[index1];
}
}
num = plus - minus + nums[roman.indexOf(s.charAt(s.length()-1))];
return num;
}
```