题解 | #人民币转换#

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

public class Main {
    private static final HashMap<Integer, String> numMap = new HashMap<Integer, String>(){{
        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");
        put(10, "拾");
        put(100, "佰");
        put(1000, "仟");
    }};
    private static final String[] units = new String[]{"", "万", "亿"};

    public static void main(String[] args){
        Scanner in = new Scanner(System.in);

        while(in.hasNext()){
            solution(in);
        }
    }

    /**
     * 模拟法
     * @param in
     */
    private static void solution(Scanner in){
        String[] money = in.nextLine().split("\\.");

        // 整数
        String number = money[0];
        // 小数
        String fraction = money[1];

        int numLen = number.length();
        int times = numLen / 4;
        int remainder = numLen % 4;

        StringBuilder result = new StringBuilder();

        // 整数部分 从右到左 每4位数转换一次
        for(int i=1; i<=times; i++){
            result.insert(0, transfer(Integer.parseInt(number.substring(numLen-i*4, numLen-(i-1)*4)))+units[i-1]);
        }
        if(remainder > 0){
            if(times == 0){
                result.insert(0, transfer(Integer.parseInt(number.substring(0, remainder))));
            }else{
                result.insert(0, transfer(Integer.parseInt(number.substring(0, remainder)))+units[times]);
            }
        }
        if(Integer.parseInt(number) > 0){
            result.append("元");
        }

        // 小数部分
        if("00".equals(fraction)){
            result.append("整");
        }else{
            // 角
            if(fraction.charAt(0) != '0'){
                result.append(numMap.get(Integer.parseInt(String.valueOf(fraction.charAt(0))))).append("角");
            }
            // 分
            if(fraction.charAt(1) != '0'){
                result.append(numMap.get(Integer.parseInt(String.valueOf(fraction.charAt(1))))).append("分");
            }
        }

        result.insert(0, "人民币");
        System.out.println(result);
    }

    /**
     * 四位数 转 中文
     * @param num
     * @return
     */
    private static String transfer(int num){
        StringBuilder sb = new StringBuilder();

        // 千位
        int thousandthDigit = num / 1000;
        int thousandthRemainder = num % 1000;
        if(thousandthDigit > 0){
            sb.append(numMap.get(thousandthDigit)).append(numMap.get(1000));
            if(0<thousandthRemainder && thousandthRemainder<100){
                sb.append("零");
            }
        }

        // 百位
        int hundredthDigit = thousandthRemainder / 100;
        int hundredthRemainder = thousandthRemainder % 100;
        if(thousandthRemainder >= 100){
            sb.append(numMap.get(hundredthDigit)).append(numMap.get(100));
            if(0<hundredthRemainder && hundredthRemainder<10){
                sb.append("零");
            }
        }

        // 十位
        int tenthDigit = hundredthRemainder / 10;
        int tenthRemainder = hundredthRemainder % 10;
        if(hundredthRemainder >= 10){
            if(tenthDigit == 1){
                sb.append(numMap.get(10));
            }else{
                sb.append(numMap.get(tenthDigit)).append(numMap.get(10));
            }
        }

        // 个位
        if(tenthRemainder > 0){
            sb.append(numMap.get(tenthRemainder));
        }

        return sb.toString();
    }
}