java:将浮点数转换为字符串，将字符串转换为浮点数 [英] java : convert float to String and String to float

问题描述

如何将浮点数转换为字符串或将字符串转换为浮点数?

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

在我的例子中，我需要在 2 个字符串值(我从表中得到的值)和我计算的浮点值之间进行断言.

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;

我尝试了从浮点到字符串:

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 类.

Using Java’s Float class.

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

要进行比较，最好将字符串转换为浮点数并作为两个浮点数进行比较.这是因为对于一个浮点数，有多个字符串表示形式，当作为字符串进行比较时它们是不同的(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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