Roman Numerals in Java
- 1 minMany developers when trying to learn a new language, they use a kata they’re familiar with. Since I started learning Java and having done Roman Numerals several times already in Ruby, I found it appropriate to use it in order to explore Java.
Below is a video of me starting the kata and stopping at the usual point once the algorithm becomes clear and the first two special cases, 4 and 9, are in place. Underneath the video you will find the full implementation.
class RomanNumeral {
public static String convert(int number) {
String roman = "";
int[] arabic_numerals = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
String[] roman_numerals = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
for (int i = 0; i < arabic_numerals.length; i++) {
while (number >= arabic_numerals[i]) {
roman += roman_numerals[i];
number -= arabic_numerals[i];
}
}
return roman;
}
}
Personal blog of Makis Otman