如何通过j2me api解析包含负数的字符串? [英] How to parse string containing negative number by j2me api?

问题描述

我有一个带数字的字符串.我必须解析此字符串并将这些数字存储在int，float等中.

I have a string which has numbers. I have to parse this string and store these numbers in int, float, etc. Accordingly

String str = "100,2.0,-100,19.99,0";

我可以在拆分后通过Integer.parseInt()和Float.parseFloat()进行操作.但是我不能做负数.它引发异常java.lang.NumberFormatException.搜索网络后，我找不到该问题的任何解决方案.

I can do it by Integer.parseInt() and Float.parseFloat() after splitting. But I can't do it for negative number. It throws exception java.lang.NumberFormatException. After searching web I couldn't find any solution for this problem.

那么我该如何解析字符串中的负整数并使用j2me api set存储到int中呢?

So how can I parse a negative integer from string and store into int using j2me api set?

推荐答案

与正数相比，解析负数应该没有什么特别的地方.

There should be nothing special to parsing negative numbers compared to positive number.

float f = Float.parseFloat("-1.0");

上面的代码应该可以正常工作.

The above code should work perfectly fine.

可能的代码错误之处在于，您正在尝试使用错误的小数点分隔符来解析浮点数.如果您的语言环境使用.作为小数点分隔符，则上面的代码就可以了.但是，如果您的语言环境使用,作为小数点分隔符，则解析将失败(使用NumberFormatException).

What might be wrong with your code, is that you're trying to parse a float with the wrong decimal separator. If your locale has . as decimal separator, the above code is OK. If however your locale has , as the decimal separator, the parsing will fail (with a NumberFormatException).

因此，请确保正确分割原稿，并且分割后的每个部分均采用有效格式(例如，使用正确的小数点分隔符).

So make sure you're splitting the original correctly, and that each of the parts after the split are on a valid format (e.g. with the correct decimal separator).

更新:
如果您想知道如何使用特定的语言环境来解析数字，则可以查看

Update:
If you want to know how to parse a number using a specific locale, you could for instance look at this question.

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