如何以人类可读的格式显示BigDecimal值？

Question

Suppose we have a BigDecimal variable setted up like this, and we can't change the way of it's creation:

BigDecimal num = new BigDecimal(6.0053);

So we'll see the following 'pretty' value after an output:

System.out.println(num);   //0053000000000000824229573481716215610504150390625

The only way I've found to resolve this problem was using BigDecimal.valueOf():

System.out.println(BigDecimal.valueOf(num.doubleValue()));   //6.0053

But is there a more simple solution?

Thanks in advance.

Answer 1

Use java.text.DecimalFormat to format the numbers.

NumberFormat format = new DecimalFormat("0.####");
System.out.println(format.format(num));

The format options can be found here

Answer 2

BigDecimal num = new BigDecimal(6.0053);
DecimalFormat df=new DecimalFormat("0.0000");
System.out.println(df.format(num));

Answer 3

System.out.println(new DecimalFormat("###,##0.00").format(myBigDecimalVariable));

Answer 4

You can use String.format with the " g " formatting type. It allows you to control how many digits you want, etc. See here for all formatting options.

BigDecimal num = new BigDecimal(6.0053);
String formated = String.format("%6.5g", num);
System.out.println(formated);

(Result : 6.0053 )