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NumberUtil新增正整数转罗马数字，限制[1,3999]的正整数

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dazer007 2024-01-19 22:30:22 +08:00
parent 3da217a627
commit a599172b4f
1 changed files with 33 additions and 0 deletions
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33
hutool-core/src/main/java/org/dromara/hutool/core/math/NumberUtil.java
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@ -1554,4 +1554,37 @@ public class NumberUtil extends NumberValidator {
}
return equals(toBigDecimal(n), BigDecimal.ZERO);
}
/**
* 整数转罗马数字<br>
* 限制：[1,3999]的正整数
* <ul>
* <li>I 1</li>
* <li>V 5</li>
* <li>X 10</li>
* <li>L 50</li>
* <li>C 100</li>
* <li>D 500</li>
* <li>M 1000</li>
* </ul>
*
* @param num [1,3999]的正整数
* @return 罗马数字
* @since 6.0.0
* @author dazer
*/
public static String intToRoman(int num) {
if (num > 3999 || num < 1 ){
return "";
}
String[] thousands = {"", "M", "MM", "MMM"};
String[] hundreds = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"};
String[] tens = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"};
String[] ones = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};
return thousands[num / 1000] +
hundreds[(num % 1000) / 100] +
tens[(num % 100) / 10] +
ones[num % 10];
}
}