Question

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";

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.

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

Answer 1

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

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

The above code should work perfectly fine.

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).

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).

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