VERSION JAVA DE : ROMANUTILS, TOUT POUR CONVERTIR LES CHIFFRES ROMAINS VERS LES ENTIERS ET INVERSEMENT

public class RomanUtils 
{
	private final static String[] acceptedchar={"I","V","X","L","C","D","M"};
	
	private final static String[] _RRUTR = {"","I","II","III","IV","V","VI","VII","VIII","IX"};
	private final static String[] _RRDTR = {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
	private final static String[] _RRCTR = {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
	private final static String[] _RRMTR = {"","M","MM","MMM","","","","","",""};

	
	/**
	 * Validate if the string entered is a right Roman number
	 * @param val
	 * @return true if ok
	 */
	static boolean IsRomanNumber(String val)
	{
		boolean actuval;
		
		for (int i=0;i<val.length();i++)
		{
			actuval=false;
			for (int j=0;j<acceptedchar.length;j++)
				if (val.substring(i, i+1).equals(acceptedchar[j])) actuval=true;
			if (actuval==false) return false;
		}
		return true;
	}
	
	/**
	 * Validate if the entered integer value is in the accepted limits
	 * @param val
	 * @return true if ok
	 */
	static boolean IsRomanNumber(int val)
	{
		if ((val>0)&&(val<=39999)) return true;
		return false;
	}
	
	/**
	 * return the value of a Roman figure
	 * @param vv = The figure
	 * @return The corresponding value
	 */
	static int RomanCharToValue(char vv)
	{
		switch (vv)
		{
			case 'I': return 1;
			case 'V': return 5;
			case 'X': return 10;
			case 'L': return 50;
			case 'C': return 100;
			case 'D': return 500;
			case 'M': return 1000;
		}
		return 0;
	}
	
	/**
	 * Return the Roman number string corresponding to the value entered.  
	 * @param value to convert
	 * @return String value
	 */
	public static String IntToRoman(int i)
	{
		if (IsRomanNumber(i))
		{
			
			if (i>=0 && i<=9) return _RRUTR[i];
			if (i>=10 && i<=99) return _RRDTR[i / 10]+ _RRUTR[i % 10];
			if (i>=100 && i<=999) return _RRCTR[i / 100]+ _RRDTR[(i / 10) % 10]+ _RRUTR[i % 10];
			if (i>=1000 && i<=3999) return _RRMTR[i / 1000]+_RRCTR[(i / 100) % 10]+_RRDTR[(i / 10) % 10]+_RRUTR[i % 10];

		}//endif
		
		return "";
	}
	
	/**
	 * Return the int value correspondif of a Roman String entered
	 * @param value in roman figures
	 * @return int value
	 */
	public static int RomanToInt(String RN)
	{
		int oc,NewRV,OldRV=0,Result=0;
		
		if (IsRomanNumber(RN))
		{
			for (oc=0;oc<RN.length();oc++)
			{
				NewRV = RomanCharToValue(RN.toCharArray()[oc]);
				if (NewRV > OldRV)
				{
					Result+=NewRV-(OldRV<<1);
				}else
				{
					Result+=NewRV;
				}//endif
				OldRV=NewRV;
			}//endfor
			
		}else
			return -1;//endif

		return Result;
	}
}