题解 | #人民币转换#

import java.util.*;

public class Main {
    private static Map<Character, String> map = new HashMap<Character, String>() {{
        put('0', "零");
        put('1', "壹");
        put('2', "贰");
        put('3', "叁");
        put('4', "肆");
        put('5', "伍");
        put('6', "陆");
        put('7', "柒");
        put('8', "捌");
        put('9', "玖");
    }};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String money = sc.next();
            String[] split = money.split("\\.");
            // 整数位
            String intMoney = split[0];
            // 小数位
            String decimal = split[1];
            StringBuilder decimalBuilder = new StringBuilder();
            if (decimal.equals("00")) {
                decimalBuilder.append("整");
            } else {
                char corner = decimal.charAt(0);
                char minute = decimal.charAt(1);
                if (corner != '0') {
                    decimalBuilder.append(map.get(corner) + "角");
                }
                if (minute != '0') {
                    decimalBuilder.append(map.get(minute) + "分");
                }
            }
            if (intMoney.equals("0")) {
                System.out.println("人民币" + decimalBuilder);
            } else {
                StringBuilder intBuilder = new StringBuilder();
                int length = intMoney.length();
                for (int i = length - 1; i >= 0; i--) {
                    int j = length - i;
                    char c = intMoney.charAt(i);
                    if (c == '0') {
                        intBuilder.insert(0, "零");
                        continue;
                    }
                    String number = map.get(c);
                    if (j % 9 == 0) {
                        number += "亿";
                    } else if (j % 5 == 0) {
                        number += "万";
                    } else if (j % 4 == 0) {
                        number += "仟";
                    } else if (j % 2 == 0) {
                        if (c == '1') {
                            number = "拾";
                        } else {
                            number += "拾";
                        }
                    } else if (j % 7 == 0 || j % 3 == 0) {
                        number += "佰";
                    }
                    intBuilder.insert(0, number);
                }
                String result = "人民币" + intBuilder + "元" + decimalBuilder;
                result = result.replaceAll("[零]{1,}", "零");
                System.out.println(result);
            }
        }
    }
}