[2019.01.11] algorithm learning record - Arabic numeral turn Chinese money (to be improved)

public class Test {
    public static void main(String[] args) {
        System.out.println(outputMoney(3487031));
    }

    public static String exchangeNumber(String num) {
        String result = "";
        switch (num) {
            case "0":
                result = "零";
                break;
            case "1":
                result = "壹";
                break;
            case "2":
                result = "贰";
                break;
            case "3":
                result = "叁";
                break;
            case "4":
                result = "肆";
                break;
            case "5":
                result = "伍";
                break;
            case "6":
                result = "陆";
                break;
            case "7":
                result = "柒";
                break;
            case "8":
                result = "捌";
                break;
            case "9":
                result = "玖";
                break;
        }
        return result;
    }

    public static String danWeiExchange(int i) {
        String[] danwei = new String[4];
        danwei[0] = "元";
        danwei[1] = "十";
        danwei[2] = "百";
        danwei[3] = "千";
        return danwei[i];
    }

    public static String danWeiExchange2(int i) {
        String[] danwei = new String[4];
        danwei[0] = "万";
        danwei[1] = "十";
        danwei[2] = "百";
        danwei[3] = "千";
        return danwei[i];
    }

    public static String outputMoney(int number) {
        String result = "";
        if(number<10000){
            String valueQ = String.valueOf(number);
            char[] arrQ = valueQ.toCharArray();
            int weiQ = arrQ.length;
            for(int i=0; i< weiQ; i++){
                if(arrQ[i] != '0'){
                    result += exchangeNumber(String.valueOf(arrQ[i]))+danWeiExchange(weiQ-i-1);
                }
            }
        }
        if(10000<=number && number<100000000){
            String resultXiao = "";
            String resultDa = "";
            int numberXiao = number-number/10000*10000;
            int numberDa = number/10000;
            String valueXiao = String.valueOf(numberXiao);
            String valueDa = String.valueOf(numberDa);
            char[] arrXiao = valueXiao.toCharArray();
            int weiXiao = arrXiao.length;
            for(int i = 0; i<weiXiao;i++){
                if(arrXiao[i] != '0'){
                    resultXiao += exchangeNumber(String.valueOf(arrXiao[i])) + danWeiExchange(weiXiao -i-1);
                }
            }
            char[] arrDa = valueDa.toCharArray();
            int weiDa = arrDa.length;
            for(int i = 0; i< weiDa; i++){
                if(arrDa[i] != '0'){
                    resultDa += exchangeNumber(String.valueOf(arrDa[i])) + danWeiExchange2(weiDa-i-1);
                }
            }
            result = resultDa + resultXiao;
        }
        return result;

    }
}