BigDecimal，最小2位数

Question

I saw Using BigDecimal to work with currencies but I have a little different problem.

I give object with BigDecimal parameters to PDF generation library and I can't use Formatter, only send objects. Is possible that default toString method always writes BigDecimal objects in format *.xx wg 134.40 ?

I use setScale but it doesn't work for eg 134.300 because it writes 134.3 instead of 134.30

Answer 1

I assume the problem is that you have forgotten that BigDecimal is immutable and setScale doesn't alter the existing BigDecimal

BigDecimal decimal = BigDecimal.valueOf(134.4);
BigDecimal decimal2 = decimal.setScale(2, RoundingMode.HALF_UP);
System.out.println(decimal2);

prints

134.40

BTW to do the same thing with double

double d = 134.4;
System.out.printf("%.2f%n", d);

Answer 2

只需使用NumberFormat.getCurrencyInstance().format(n)并将结果字符串传递给PDF生成库。