java：将float转换为String，将String转换为float [英] java : convert float to String and String to float

问题描述

我如何从float转换为string或string转换为float？

How could I convert from float to string or string to float?

在我的情况下，我需要在2个值之间进行断言字符串（我有的值）来自表）和我计算的浮点值。

In my case I need to make the assertion between 2 values string (value that I have got from table) and float value that I have calculated.

String valueFromTable = "25";
Float valueCalculated =25.0;

我尝试从float到string：

I tried from float to string:

String sSelectivityRate = String.valueOf(valueCalculated );

但断言失败

推荐答案

使用Java的 Float class。

Using Java’s Float class.

float f = Float.parseFloat("25");
String s = Float.toString(25.0f);

比较它总是更好的将字符串转换为float并比较为两个浮点数。这是因为对于一个浮点数，有多个字符串表示，当作为字符串进行比较时是不同的（例如25！=25.0！=25.00等）。

To compare it's always better to convert the string to float and compare as two floats. This is because for one float number there are multiple string representations, which are different when compared as strings (e.g. "25" != "25.0" != "25.00" etc.)

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