罗马数字转整数 java实现

好的，我可以回答这个问题。以下是将罗马数字转换为整数的Java代码：

public int romanToInt(String s) {
    int result = 0;
    Map<Character, Integer> map = new HashMap<>();
    map.put('I', 1);
    map.put('V', 5);
    map.put('X', 10);
    map.put('L', 50);
    map.put('C', 100);
    map.put('D', 500);
    map.put('M', 1000);

    for (int i = 0; i < s.length(); i++) {
        int value = map.get(s.charAt(i));
        if (i < s.length() - 1 && value < map.get(s.charAt(i+1))) {
            result -= value;
        } else {
            result += value;
        }
    }

    return result;
}

希望可以帮助到您。

相关问题

请写一段整数转罗马数字的Java代码

以下是Java代码：

public String intToRoman(int num) {
    String[] romanSymbols = {"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
    int[] integers = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
    StringBuilder sb = new StringBuilder();
    int i = 0;
    while (num > 0) {
        if (num - integers[i] >= 0) {
            sb.append(romanSymbols[i]);
            num -= integers[i];
        } else {
            i++;
        }
    }
    return sb.toString();
}

这段代码可以将一个整数转换为罗马数字，并将其以字符串形式返回。

java罗马数字转换

在Java中，可以使用以下代码将数字转换为罗马数字：

public class RomanNumeralUtil {
    private static final int MIN_VALUE = 1;
    private static final int MAX_VALUE = 5999;
    private static final String\[\] RN_M = {"", "M", "MM", "MMM", "MMMM", "MMMMM"};
    private static final String\[\] RN_C = {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"};
    private static final String\[\] RN_X = {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"};
    private static final String\[\] RN_I = {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"};

    public static String generate(int number) {
        if (number < MIN_VALUE || number > MAX_VALUE) {
            throw new IllegalArgumentException(
                    String.format("The number must be in the range \[%d, %d\]", MIN_VALUE, MAX_VALUE));
        }
        return RN_M\[number / 1000\] + RN_C\[number % 1000 / 100\] + RN_X\[number % 100 / 10\] + RN_I\[number % 10\];
    }
}

这个代码定义了一个`RomanNumeralUtil`类，其中的`generate`方法接受一个整数作为参数，并返回对应的罗马数字。该方法首先检查输入的数字是否在指定范围内，然后根据数字的千位、百位、十位和个位分别从对应的数组中获取罗马数字的表示，最后将它们拼接起来返回。

你可以使用`RomanNumeralUtil.generate(number)`来将一个整数`number`转换为罗马数字。
#### 引用[.reference_title]
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