Roman Numeral To Decimal in Java

 A simple program to ask the user to give roman numeral and then the program will convert the given roman numeral into decimal equivalent using Java programming language.

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Program Listing
import java.util.*;
import java.util.Scanner;  


class Roman_To_Decimal
{ 

public static int romanToInteger(String roman) 
 {
    Map<Character,Integer> numbersMap = new HashMap<>();
    numbersMap.put('I',1);
    numbersMap.put('V',5);
    numbersMap.put('X',10);
    numbersMap.put('L',50);
    numbersMap.put('C',100);   
    numbersMap.put('D',500);   
    numbersMap.put('M',1000);  
        
    int result=0;
        
    for(int i=0;i<roman.length();i++)
    {
      char ch = roman.charAt(i);      // Current Roman Character
      
      //Case 1
      if(i>0 && numbersMap.get(ch) > numbersMap.get(roman.charAt(i-1)))
      {
        result += numbersMap.get(ch) - 2*numbersMap.get(roman.charAt(i-1));
      }
      
      // Case 2: just add the corresponding number to result.
      else
        result += numbersMap.get(ch);
    }
        
    return result;
 }
 
  
 public static void main(String args[])
 {
	 
	 Scanner input = new Scanner(System.in);  // Create a Scanner object
	 
	 System.out.println("\n");
	 System.out.print("\t\tRoman Numeral To Decimal in Java");
	 System.out.println("\n");
	 System.out.print("\tGive Roman Numberal Value : ");

    String romanNumber = input.nextLine(); 

    int result = romanToInteger(romanNumber.toUpperCase());
   
    
   System.out.println();
   System.out.println("\tThe Roman Number is: "+romanNumber.toUpperCase());
   System.out.println();
   System.out.println("\tIts Decimal Value is: "+result);
   
   System.out.println();
   System.out.println("\tEnd of Program");
   System.out.println();
   input.close();
 }
}