Java 使用前导 0 将双精度格式设置为 2 个小数位

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时间:2020-08-14 07:47:59  来源:igfitidea点击:

Format double to 2 decimal places with leading 0s

javadouble

提问by Bat_Programmer

Possible Duplicate:
Round a double to 2 significant figures after decimal point

可能的重复:将双精度舍入
到小数点后的 2 个有效数字

I am trying to format a double to 2 decimal places with leading zeros and there's no luck. Here is my code:

我试图用前导零格式化双到 2 个小数位,但没有运气。这是我的代码:

Double price = 32.0;
DecimalFormat decim = new DecimalFormat("#.##");
Double price2 = Double.parseDouble(decim.format(price));

And I want output to be 32.00instead I get 32.0
Any solutions??

我想要输出32.00而不是我得到32.0
任何解决方案?

采纳答案by Tony Ennis

OP wants leading zeroes. If that's the case, then as per Tofubeer:

OP 需要前导零。如果是这种情况,那么根据 Tofubeer:

    DecimalFormat decim = new DecimalFormat("0.00");


Edit:

编辑:

Remember, we're talking about formatting numbers here, not the internal representation of the numbers.

请记住,我们在这里讨论的是格式化数字,而不是数字的内部表示。

    Double price = 32.0;
    DecimalFormat decim = new DecimalFormat("0.00");
    Double price2 = Double.parseDouble(decim.format(price));
    System.out.println(price2);

will print price2using the defaultformat. If you want to print the formatted representation, print using the format:

price2使用默认格式打印。如果要打印格式化的表示,请使用以下格式打印:

    String s = decim.format(price);
    System.out.println("s is '"+s+"'");

In this light, I don't think your parseDouble()is doing what you want, nor can it.

从这个角度parseDouble()来看,我不认为你正在做你想做的,也不能。

回答by TofuBeer

Try this:

尝试这个:

 DecimalFormat decim = new DecimalFormat("#.00");