JAVA : Menukar Nilai Decimal Kepada Angka Roman

import java.io.*;
class RomanNumber
{
    static String[]arr1={"","I","II","III","IV","V","VI","VII","VIII","IX"};
    static String[]arr2={"","X","XX","XXX","XL","L"};
    public static void main(String args[])throws Exception
    {
    
        BufferedReader br =new BufferedReader (new InputStreamReader(System.in));
        int d1,d2;
        System.out.println("Enter the number in Decimal number system (1-50):");
        int num=Integer.parseInt(br.readLine());
        if(num<=50)
        {
            if(num<10)
            {
             d1=num%10;
            System.out.println("Roman number is:"+arr1[d1]);
            }
            else 
            {
                d1=num%10;
                d2=num/10;
                System.out.println("Roman number is:-"+arr2[d2]+arr1[d1]);
            }
        }
        else
        {
            System.out.println("Number is not between 1 to 50");
        }
    }
}