题解 | #人民币转换#

import java.util.*;
import java.util.stream.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        String[] cnNames =
            "零、壹、贰、叁、肆、伍、陆、柒、捌、玖".split("、");
        String[] levelName = "拾、佰、仟".split("、");
        Scanner in = new Scanner(System.in);
        String[] line = in.nextLine().split("\\.");

        List<Integer> numPartList = Arrays.stream(line[0].split("")).map(
                                        x -> Integer.parseInt(x)).collect(Collectors.toList());
        Collections.reverse(numPartList);
        List<String> output = new ArrayList<>();
        for (int i = 0; i < numPartList.size() / 4 + 1; i++) {
            if (4 * i < numPartList.size()) {
                if (i == 1) {
                    output.add("万");
                } else if (i == 2) {
                    output.add("亿");
                }
            }
            for (int k = 0; k < 4 && 4 * i + k < numPartList.size(); k++) {
                int num = numPartList.get(4 * i + k);
                if (num == 0 && (k == 0 || numPartList.get(4 * i + k - 1) == 0)) {
                    continue;
                }
                String cnName = cnNames[num];
                String outCnName = cnName;
                if (k > 0 && num > 0) {

                     String itemLevelName = levelName[k - 1];
                    if ( "壹".equals(cnName) && "拾".equals(itemLevelName)) {
                        outCnName = itemLevelName;
                    } else {
                        outCnName += itemLevelName;
                    }
                }
                output.add(outCnName);
            }
        }
        Collections.reverse(output);
         if (!output.isEmpty()) {
            output.add("元");
        }

        List<String> secondPartOutPut = new ArrayList<>();
        if (line.length == 2) {
            int[] secondPart = Arrays.stream(line[1].split("")).mapToInt(
                                   x -> Integer.parseInt(x)).toArray();
            for (int i = 0; i < 2 && i < secondPart.length; i++) {
                int num = secondPart[i];
                if (num != 0) {
                    String cnName = cnNames[num];
                    if (i == 0) {
                        cnName += "角";
                    } else if (i == 1) {
                        cnName += "分";
                    }
                    secondPartOutPut.add(cnName);
                }
            }
        }

        if (secondPartOutPut.isEmpty()) {
            output.add("整");
        } else {
            output.addAll(secondPartOutPut);
        }

        System.out.println("人民币" + String.join("", output));


        in.close();
    }
}