30行，金额转人民币大写的代码 - 史蒂芬.王

原帖地址：http://www.cnblogs.com/stephen-wang/p/3155958.html

金额转人民币大写是一种常见的要求，但是这一看似简单的要求，实现起来却并不容易。

前不久，我被问到了这样一道题，当时写了个算法，昨天晚上又和BJDP的人们讨论了一下，觉得很有必要把这个算法写下来。

总共36行，去掉空行还不到30行，就不多啰嗦解释了。

1 public class ChineseCurrencyConverter {
2
3 private static final String[] UNITS = {"亿","仟万","佰万","拾万","万","仟","佰","拾","" };
4 private static final String[] CHINESE_NUMBER = {"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
5
6 public static String convert(long yuan) {
7
8 if (yuan >= 1e9 || yuan < 0) {
9 return "这个数字超出解析范围了";
10 }
11 String amount = String.valueOf(yuan);
12 int len = amount.length();
13 int unitsLen = UNITS.length;
14
15 String chineseCurrency = "";
16 for (int i = len - 1; i >= 0; i--) {
17 chineseCurrency = number(amount.charAt(i)) + unit(amount.charAt(i), unitsLen - len + i) +chineseCurrency;
18 }
19
20 chineseCurrency = chineseCurrency.replaceAll("零+","零");
21 chineseCurrency = chineseCurrency + "元整";
22 chineseCurrency = chineseCurrency.replaceAll("零元","元");
23 return chineseCurrency;
24 }
25
26 private static String number(char number) {
27 return CHINESE_NUMBER[Integer.parseInt(String.valueOf(number))];
28 }
29
30 private static String unit(char number, int pos) {
31 if(number == '0') {
32 return "";
33 }
34 return UNITS[pos];
35 }
36 }

 

下面是一些用来测试的代码：

1 public class TestConverter {
2
3 public static void main(String[] args) {
4 System.out.println(ChineseCurrencyConverter.convert(100));
5 System.out.println(ChineseCurrencyConverter.convert(130));
6 System.out.println(ChineseCurrencyConverter.convert(102));
7 System.out.println(ChineseCurrencyConverter.convert(124));
8 System.out.println(ChineseCurrencyConverter.convert(1000));
9 System.out.println(ChineseCurrencyConverter.convert(10000));
10 System.out.println(ChineseCurrencyConverter.convert(100000));
11 System.out.println(ChineseCurrencyConverter.convert(1000000));
12 System.out.println(ChineseCurrencyConverter.convert(10000000));
13 System.out.println(ChineseCurrencyConverter.convert(10000000));
14 System.out.println(ChineseCurrencyConverter.convert(100000000));
15 System.out.println(ChineseCurrencyConverter.convert(1000000000));
16 System.out.println(ChineseCurrencyConverter.convert(1002));
17 System.out.println(ChineseCurrencyConverter.convert(1020));
18 System.out.println(ChineseCurrencyConverter.convert(1200));
19 System.out.println(ChineseCurrencyConverter.convert(10003));
20 System.out.println(ChineseCurrencyConverter.convert(10030));
21 System.out.println(ChineseCurrencyConverter.convert(10033));
22 System.out.println(ChineseCurrencyConverter.convert(10330));
23 System.out.println(ChineseCurrencyConverter.convert(13030));
24 System.out.println(ChineseCurrencyConverter.convert(100030));
25 System.out.println(ChineseCurrencyConverter.convert(100003));
26 System.out.println(ChineseCurrencyConverter.convert(100300));
27 System.out.println(ChineseCurrencyConverter.convert(103000));
28 System.out.println(ChineseCurrencyConverter.convert(100303));
29 System.out.println(ChineseCurrencyConverter.convert(1000004));
30 System.out.println(ChineseCurrencyConverter.convert(10000005));
31 System.out.println(ChineseCurrencyConverter.convert(10000006));
32 System.out.println(ChineseCurrencyConverter.convert(100000007));
33 System.out.println(ChineseCurrencyConverter.convert(1000000008));
34
35 }
36 }

 

这些数字测试的结果还都正确。

这里没有处理角和分，留给有想法的同学去尝试一下吧。

 

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