38 lines
1.3 KiB
Java
38 lines
1.3 KiB
Java
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/**
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* Translates numbers into the Roman Numeral System.
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*
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* @see <a href="https://en.wikipedia.org/wiki/Roman_numerals">Roman numerals</a>
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* @author Sokratis Fotkatzikis
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* @version 1.0
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*/
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public class RomanNumeralUtil {
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private static final int MIN_VALUE = 1;
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private static final int MAX_VALUE = 5999;
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//1000-5999
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private static final String[] RN_M = {"", "M", "MM", "MMM", "MMMM", "MMMMM"};
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//100-900
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private static final String[] RN_C = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"};
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//10-90
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private static final String[] RN_X = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"};
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//1-9
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private static final String[] RN_I = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};
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public static String generate(int number) {
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if (number < MIN_VALUE || number > MAX_VALUE) {
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throw new IllegalArgumentException(
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String.format(
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"The number must be in the range [%d, %d]",
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MIN_VALUE,
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MAX_VALUE
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)
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);
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}
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return RN_M[number / 1000] +
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RN_C[number % 1000 / 100] +
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RN_X[number % 100 / 10] +
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RN_I[number % 10];
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}
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}
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