在java中四舍五入到小数点后2位? [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() 来四舍五入.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，但正如你所看到的，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.

输入和输出都是双精度是绝对必要的.

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

如果您更改上面代码的第 4 行并发布它，将会有很大帮助.

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

推荐答案

这个很好用...

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

输出是

123.14

或者如@Rufein所说

Or as @Rufein said

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

这也适用于您.

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