android - 如何舍入到小数点后3位？

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How to round a number to n decimal places in Java
                                
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                                5年前关闭。
            
                    
我有

double a= = 13;
double b = 6;
double c = a/b;

我想确保它以三位小数返回。我试过了

Math.round(c); //gives me an error instead.

最佳答案

如果需要格式化输出，例如打印输出或在textview中显示，请使用：

DecimalFormat threeDecRound = new DecimalFormat();
threeDecRound.setMaximumFractionDigits(3);
threeDecRound.setRoundingMode(RoundingMode.HALF_DOWN);
threeDecRound.format(number)