我如何单独格式化双值逗号

Question

我目前正在 Spring MVC 中开发工资支付模块，在应用程序级别，我将我的工资数据存储在双类型中， eg double amount=32690597我想把它格式化成 32,690,597，这样它就更易读了。建议我最好的解决方案，谢谢

Answer 1

System.out.println(String.format("%1$,.0f", amount));

或者

String formatAmount = new DecimalFormat("#,###,###,###,###").format(amount);

或 - Java 8

NumberFormat numberFormatter = NumberFormat.getNumberInstance(Locale.ENGLISH);

String formatAmount = numberFormatter.format(amount);

Answer 2

使用DecimalFormat这个问题。

double amount = 32690597;

//create pattern for decimal format

String pattern = "###,###";

DecimalFormat decimalFormat = new DecimalFormat(pattern);

//change dot with comma

String formattedNumber = decimalFormat.format(amount).replace(".",",");

详细十进制格式键；

0   A digit - always displayed, even if number has less digits (then 0 is displayed)

#   A digit, leading zeroes are omitted.

.   Marks decimal separator

,   Marks grouping separator (e.g. thousand separator)

E   Marks separation of mantissa and exponent for exponential formats.

;   Separates formats

-   Marks the negative number prefix

%   Multiplies by 100 and shows number as percentage

?   Multiplies by 1000 and shows number as per mille

¤   Currency sign - replaced by the currency sign for the Locale. Also makes formatting use the monetary decimal separator instead of normal decimal separator. ¤¤ makes formatting use international monetary symbols.

X   Marks a character to be used in number prefix or suffix

'   Marks a quote around special characters in prefix or suffix of formatted number.

一些与此相关的示例；

Pattern      Number        Formatted String

###.###      123.456       123.456

###.#        123.456       123.5

###,###.##   123456.789    123,456.79

000.###      9.95          009.95

##0.###      0.95          0.95

Answer 3

static String formatDouble(double input){

    String inputString = new String(Double.toString(input));

    char[] array= inputString.toCharArray();

    StringBuilder str = new StringBuilder("");

    for(int i = array.length-1; i >= 0; i--){

        str.insert(0, array[i]);

            if(i % 3 == 0 && i != 0){

            str.insert(0, ",");

            }

        }

    return str.toString();

    }

希望这可以帮助

更好地使用 String.format