Java Convert Integer Number to Roman Number

In this source code example, we will write a Java program to convert an integer number to Roman number.
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Java Convert Integer Number to Roman Number

Here is a Java program to convert integer number to Roman number:
package net.sourcecodeexamples.java.Conversions; import java.util.Scanner; /**  * Converting Integers into Roman Numerals  *  *('I', 1);  *('IV',4);  *('V', 5);  *('IV',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.print("Enter the integer number : "); try (Scanner scanner = new Scanner(System.in)) { int number = scanner.nextInt(); String output = IntegerToRoman.integerToRoman(number); System.out.println("Roman number : " + output); } } }

Output

Enter the integer number : 5 Roman number : V
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