相关疑难解决方法(0)

我正在尝试将for循环转换为功能代码.我需要向前看一个值,并且还要看一个值.是否可以使用流？以下代码是将罗马文本转换为数值.不确定带有两个/三个参数的reduce方法是否有帮助.

int previousCharValue = 0;
int total = 0;

for (int i = 0; i < input.length(); i++) {
    char current = input.charAt(i);

    RomanNumeral romanNum = RomanNumeral.valueOf(Character.toString(current));

    if (previousCharValue > 0) { 
        total += (romanNum.getNumericValue() - previousCharValue);
        previousCharValue = 0;
    } else {
        if (i < input.length() - 1) {

            char next = input.charAt(i + 1);
            RomanNumeral nextNum = RomanNumeral.valueOf(Character.toString(next));
            if (romanNum.getNumericValue() < nextNum.getNumericValue()) {
                previousCharValue = romanNum.getNumericValue();
            }
        }
        if (previousCharValue == 0) {
            total += romanNum.getNumericValue();
        }

    } …