题解 | #人民币转换#

递归调用，枚举所有情况

import java.util.Scanner;
import java.util.Map;
import java.util.HashMap;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static String[] wei = new String[] {"拾", "佰", "仟"};
    public static StringBuffer result = new StringBuffer();
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String input = in.nextLine();
            System.out.println("人民币" + changede(input));
        }
    }
    public static String changede(String input) {
        Map<Integer, String> map = new HashMap<>();
        map.put(0, "零"); map.put(1, "壹"); map.put(2, "贰"); map.put(3, "叁");
        map.put(4, "肆"); map.put(5, "伍"); map.put(6, "陆"); map.put(7, "柒");
        map.put(8, "捌"); map.put(9, "玖"); map.put(10, "拾");
        String[] str = input.split("\\.");
        int number = Integer.parseInt(str[0]);
        StringBuffer sb = new StringBuffer();
        zhuanhuan(number, sb, map);
        if (result.length() > 0) result.append("元");
        int xiaoshu = Integer.parseInt(str[1]);
        if (xiaoshu == 0) return result.append("整").toString();
        int shiwei = xiaoshu / 10;
        int gewei = xiaoshu % 10;
        if (shiwei == 0 && gewei != 0) return result.append(map.get(gewei)).append("分").toString();
        if (shiwei != 0 && gewei == 0) return result.append(map.get(shiwei)).append("角").toString();
        return result.append(map.get(shiwei)).append("角").append(map.get(gewei)).append("分").toString();
    }
    public static void zhuanhuan(int number, StringBuffer sb, Map<Integer, String> map) {
        if (number == 0) {
            result = sb;
            return;
        }
        int next = number / 10000;
        int current = number % 10000;
        int gewei = current % 10;
        int shiwei = (current / 10) % 10;
        int baiwei = (current / 100) % 10;
        int qianwei = (current / 1000) % 10;
        StringBuffer temp = new StringBuffer();
        if (number >= 10000) temp.append("万");
        if (number >= 10000 && qianwei == 0) temp.append("零");
        if (qianwei != 0) temp.append(map.get(qianwei)).append("仟");
        if (qianwei != 0 && baiwei == 0 && shiwei == 0 && gewei == 0) {
            StringBuffer nextSb = temp.append(sb);
            zhuanhuan(next, nextSb, map);
            return;
        }
        if (baiwei == 0 && qianwei != 0) temp.append("零");
        if (baiwei != 0) temp.append(map.get(baiwei)).append("佰");
        if (baiwei != 0 && shiwei == 0 && gewei == 0) {
            StringBuffer nextSb = temp.append(sb);
            zhuanhuan(next, nextSb, map);
            return;
        }
        if (shiwei == 0 && baiwei != 0) temp.append("零");
        if (shiwei != 0) {
            if (shiwei != 1) {
              temp.append(map.get(shiwei)).append("拾"); 
            } else {
              temp.append("拾");
            }
        }
        if (gewei != 0)  temp.append(map.get(gewei));
        StringBuffer nextSb = temp.append(sb);
        zhuanhuan(next, nextSb, map);
    }
}