在Java中最多2位小数？ [英] round up to 2 decimal places in java?

问题描述

我已经阅读了很多stackoverflow问题，但似乎没有一个对我有用。我正在使用 math.round（）进行舍入。
这是代码：

I have read a lot of stackoverflow questions but none seems to be working for me. i am using math.round() to round off. this is the code:

class round{
    public static void main(String args[]){

    double a = 123.13698;
    double roundOff = Math.round(a*100)/100;

    System.out.println(roundOff);
}
}

我得到的输出是： 123 但我希望它是 123.14 。我读到添加 * 100/100 会有所帮助，但你可以看到我没有设法让它工作。

the output i get is: 123 but i want it to be 123.14. i read that adding *100/100 will help but as you can see i didn't manage to get it to work.

输入和输出都必须是双倍的。

it is absolutely essential for both input and output to be a double.

如果你改变上面代码的第4行，那将是非常有用的。发布它。

it would be great great help if you change the line 4 of the code above and post it.

推荐答案

这个有效......

double roundOff = Math.round(a * 100.0) / 100.0;

输出

123.14

或者@Rufein说

 double roundOff = (double) Math.round(a * 100) / 100;

这也适合你。

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