Here is the Java program to convert Ordinary Number to Roman Number.

```Input : 1500
Output : MD```

## Ordinary Number to Roman :

[java]

package com.onlinetutorialspoint.javaprograms;

import java.util.Scanner;

public class OrdinaryNumber_RomanNumber {

public static void main(String k[]) {
Scanner sc = new Scanner(System.in);
System.out.print("Number to Convert to Roman : ");
int number = sc.nextInt();
Roman r = new Roman();
r.set(number);
r.convert();
}
}

class Roman {
int n;

void set(int x) {
n = x;
}

void convert() {
if (n <= 0) {
System.out.print("NO ROMAN FOR THE GIVEN NUMBER");
} else {
while (n >= 1000) {
System.out.print("M");
n = n – 1000;
}
if (n >= 900) {
System.out.print("CM");
n = n – 900;
}
if (n >= 500) {
System.out.print("D");
n = n – 500;
}
if (n >= 400) {
System.out.print("CD");
n = n – 400;
}
while (n >= 100) {
System.out.print("C");
n = n – 100;
}
if (n >= 90) {
System.out.print("XC");
n = n – 90;
}
if (n >= 50) {
System.out.print("L");
n = n – 50;
}
if (n >= 40) {
System.out.print("XL");
n = n – 40;
}
while (n >= 10) {
System.out.print("X");
n = n – 10;
}
if (n >= 9) {
System.out.print("IX");
n = n – 9;
}
if (n >= 5) {
System.out.print("V");
n = n – 5;
}
if (n >= 4) {
System.out.print("IV");
n = n – 4;
}
while (n >= 1) {
System.out.print("I");
n = n – 1;
}
System.out.println();
}
}
}

[/java]

Output :

```Number to Convert to Roman : 1500
MD```