Program to convert Roman numerals to Decimal i.e. Integer number

Author: Kartik Siddhabathula

ArraysStrings/RomanToInt.java

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+package programcreek.ArraysStrings;
+
+/*
+ * author: Kartik
+ * Program to convert Roman numerals to Decimal i.e. Integer number
+ */
+
+import java.util.Map;
+
+public class RomanToInt {
+
+	public static void main(String[] args) {
+		String roman = "LIX";
+		int num = romanToInteger(roman);
+		System.out.println(num);
+
+	}
+
+	private static int romanToInteger(String s) {
+		Map<Character, Integer> map = Map.of('I',1, 'V',5,'X',10,'L',50,'C',100,'D',500,'M',1000);
+		int sum = map.get(s.charAt(s.length()-1));
+		for(int i=s.length()-2;i>=0;i--) {
+			if(map.get(s.charAt(i)) < map.get(s.charAt(i+1))) {
+				sum -= map.get(s.charAt(i));
+			}else {
+				sum += map.get(s.charAt(i));
+			}
+		}
+		return sum;
+	}
+
+}