double f = 111231.5585;
System.out.println(String.format("%.2f", f));
2、用DecimalFormat的format方法;
DecimalFormat的format方法
double f = 111231.5585;
DecimalFormat df = new DecimalFormat("#.00");
System.out.println(df.format(f));
double f = 111231.5585;
BigDecimal bg = new BigDecimal(f);
double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
System.out.println(f1);
double f = 111231.5585;
NumberFormat nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
System.out.println(nf.format(f));
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