Converting Integers to Roman Numerals - Java

     Roman Number are a system of numerical notations used by the Romans.

1 = I 5 = V 10 = X 50 = L 100 = C 500 = D 1000 = M = I 5000 = V 10,000 = X 50,000 = L 100,000 = C = I 500,000 = D = V 1,000,000 = M = X 5,000,000 = V = L 10,000,000 = X = C 50,000,000 = L = D 100,000,000  = C = M 500,000,000  = D 1,000,000,000 = M nn = 1000×nn nn = 100,000×nn nn = 1,000,000×nn

import java.util.*;
class RomanCounting {

  public static void main(String[] args) {
  int num;
  System.out.println("please the number smallest than 999999");
  System.out.println("According to automated program show 5000 as |V| and 10000 as |X| "
    + "and \n 50000 "
    + "as |L| and 100000 as |C| and 500000 as |D| and last as 1000000 as |M| ");
  Scanner obj = new Scanner(System.in);
  num = obj.nextInt();
  String str = String.valueOf(num);
  char []arr = str.toCharArray();

  int len = str.length();
  int count[] = new int[10];
  for(int i=0;i<len;i++){
      count[i] = (int)arr[i]-48; }
    
  String ones[] = new String[]{"","I","II","III","IV","V","VI","VII","VIII","IX","X"}; 
  String tens[] = new String[]{"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC","C"};
  String hundred[] = new String[]{"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM","M"};
  String thousand[] = new String[]{"","M","MM","MMM","MMMM","|V|","|V|M","|V|MM","|V|MMM",
                             "M|X|","|X|"};
  
  String TenThousand[] = new String[]{"","|X|","|X||X|","|X||X||X|","|X||L|","|L||X|",
                                   "|L||X||X|","|L||X||X|","|C||L|","|C|"};
  
  String[] HundredThousand = new String[]{"","|C|","|C||C|","|C||C||C|","|C||D|","|D|",
                                      "|D||C|","|D||C||C|","|D||M|","|M|"};
  if(len==6){
   String romancounting = HundredThousand[count[0]]+ TenThousand[count[1]]+ thousand[count[2]]
                     + hundred[count[3]] + tens[count[4]] + ones[count[5]];
   System.out.println(romancounting);
  }
  else if(len==5){ 
    String romancounting = TenThousand[count[0]]+ thousand[count[1]]+ hundred[count[2]] + 
      tens[count[3]] + ones[count[4]];
    System.out.println(romancounting);
  }
  else if(len==4){
   String romancounting = thousand[count[0]]+ hundred[count[1]] + tens[count[2]] + ones[count[3]];
   System.out.println(romancounting);
     }
  else if(len==3)
  {
  String romancounting = hundred[count[0]]+tens[count[1]]+ones[count[2]];
    System.out.println(romancounting);
  }
  else if(len==2){
     String romancounting = tens[count[0]]+ones[count[1]];
     System.out.println(romancounting);
         }
  else{
   System.out.println("Sorrt But number is invalid! OutOfRange👌"); }
     
   System.out.println("Thanks for using your automated software");
  }
  }

For Output : OUTPUT