Java: double: how to ALWAYS show two decimal digits

Question

I use double values in my project and i would like to always show the first two decimal digits, even if them are zeros. I use this function for rounding and if the value I print is 3.47233322 it (correctly) prints 3.47. But when i print, for example, the value 2 it prints 2.0 .

public static double round(double d) {
    BigDecimal bd = new BigDecimal(d);
    bd = bd.setScale(2, BigDecimal.ROUND_HALF_UP);
    return bd.doubleValue();
}

I want to print 2.00!

Is there a way to do this without using Strings?

Thanks!

EDIT: from your answers (wich I thank you for) I understand that I wasn't clear in telling what I am searching (and I'm sorry for this): I know how to print two digits after the number using the solutions you proposed... what i want is to store in the double value directly the two digits! So that when I do something like this System.out.println("" + d) (where d is my double with value 2) it prints 2.00.

我开始认为没有办法做到这一点......对吗？无论如何,再次感谢您的回答,如果您知道解决方案,请告诉我们!

Answer 1

你可以使用这样的东西:

 double d = 1.234567;
 DecimalFormat df = new DecimalFormat("#.00");
 System.out.print(df.format(d));

编辑实际上回答了这个问题,因为我需要真正的答案,这出现在谷歌上,有人将其标记为答案,尽管当小数为0时这不会起作用.

Answer 2

使用java.text.NumberFormat这个:

NumberFormat nf= NumberFormat.getInstance();
nf.setMaximumFractionDigits(2);
nf.setMinimumFractionDigits(2);
nf.setRoundingMode(RoundingMode.HALF_UP);

System.out.print(nf.format(decimalNumber));

Answer 3

你可以这样做:

double d = yourDoubleValue;  
String formattedData = String.format("%.02f", d);