Bug? in Long.valueOf(String, radix)

Hi everyone,

I am currently programming a genetic algorithm(GA) for my work and a came across a small difficulty.

GA usually use binary strings for their internal operations. So I decided to use Double.toLongBits() to convert a double into a long and then Long.toBinaryString() to get a String to work with.

Here is the part of the code that confuses me a bit.

double d = -2.33;

long bit = Double.toLongBits(d);

String s = Long.toBinaryString(bit);

//now try and convert it back Binary Strings have radix 2

long back = Long.valueOf(s,2);

This last line always throws a NumberFormatException.

The code was only intended to show me that the conversion always works correctly in both directions.

If I use 2.33 instead of -2.33 it works.

Am I making a mistake or is this a bug?

Thanks for any remarks!

[882 byte] By [crazy_scientist7375] at [2007-9-30 20:59:51]