wf.utils.java.convert.IntegerToRoman Maven / Gradle / Ivy
package wf.utils.java.convert;
/**
* Converting Integers into Roman Numerals
*
*
* ('I', 1); ('IV',4); ('V', 5); ('IX',9); ('X', 10); ('XL',40); ('L', 50);
* ('XC',90); ('C', 100); ('D', 500); ('M', 1000);
*/
public class IntegerToRoman {
private static final int[] allArabianRomanNumbers = new int[] {
1000,
900,
500,
400,
100,
90,
50,
40,
10,
9,
5,
4,
1,
};
private static final String[] allRomanNumbers = new String[] {
"M",
"CM",
"D",
"CD",
"C",
"XC",
"L",
"XL",
"X",
"IX",
"V",
"IV",
"I",
};
// Value must be > 0
public static String integerToRoman(int num) {
if (num <= 0) {
return "";
}
StringBuilder builder = new StringBuilder();
for (int a = 0; a < allArabianRomanNumbers.length; a++) {
int times = num / allArabianRomanNumbers[a];
for (int b = 0; b < times; b++) {
builder.append(allRomanNumbers[a]);
}
num -= times * allArabianRomanNumbers[a];
}
return builder.toString();
}
}