小数点后仅显示2位数

Question

bill[p][l][0] = new DecimalFormat("##.##").format(Double.parseDouble(i2[m][0]));

The code entered above is not working; input 10.0 gives 10 as output.

Answer 1

It is working - a # means the digit is only printed if it's relevant (see the documentation ). Try using

bill[p][l][0] = new DecimalFormat("##.00").format(Double.parseDouble(i2[m][0]));

Answer 2

要准确格式化最多两个小数位，您应该使用##.00作为##.##将从值中删除尾随零。

Answer 3

If you want to handle both positive and negative numbers I would recommend using BigDecimal since Double technically doesn't have any decimal values to truncate. Try something like this:

new BigDecimal(i2[m][0]).setScale(2, BigDecimal.ROUND_FLOOR)