Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/conversions/IntegerToRoman.java

@@ -0,0 +1,40 @@
+package com.thealgorithms.conversions;
+
+/**
+ * Converting Integers into Roman Numerals
+ *
+ * <p>
+ * ('I', 1); ('IV',4); ('V', 5); ('IX',9); ('X', 10); ('XL',40); ('L', 50);
+ * ('XC',90); ('C', 100); ('D', 500); ('M', 1000);
+ */
+public class IntegerToRoman {
+
+    private static int[] allArabianRomanNumbers
+            = new int[]{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
+    private static String[] allRomanNumbers
+            = new String[]{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
+
+    // Value must be > 0
+    public static String integerToRoman(int num) {
+        if (num <= 0) {
+            return "";
+        }
+
+        StringBuilder builder = new StringBuilder();
+
+        for (int a = 0; a < allArabianRomanNumbers.length; a++) {
+            int times = num / allArabianRomanNumbers[a];
+            for (int b = 0; b < times; b++) {
+                builder.append(allRomanNumbers[a]);
+            }
+
+            num -= times * allArabianRomanNumbers[a];
+        }
+
+        return builder.toString();
+    }
+
+    public static void main(String[] args) {
+        System.out.println(IntegerToRoman.integerToRoman(2131));
+    }
+}