Comments on: Float.parseFloat is slow http://bitplane.net/2010/08/java-float-fast-parser/ Rants, ramblings, free software Wed, 08 Feb 2012 21:14:59 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Gaz Davidson http://bitplane.net/2010/08/java-float-fast-parser/comment-page-1/#comment-405 Gaz Davidson Wed, 23 Feb 2011 18:48:04 +0000 http://bitplane.net/?p=710#comment-405 Ah yes, a very good point. I'm guessing that the issue here is that the precision is somewhat inverse to the number of digits beyond the decimal point. I'm working away from home and haven't got a machine to test this on at the moment, but I imagine the most sensible solution would be to cap this length so that the precision is always a known number, it should speed it up a bit too. You could combine this with using doubles to store the temporary values, but if you're going to take this performance hit then it may even be worth using the latest code from Harmony; they have fixed the main problem since I reported it, plus they have proper unit tests. Ah yes, a very good point. I’m guessing that the issue here is that the precision is somewhat inverse to the number of digits beyond the decimal point.

I’m working away from home and haven’t got a machine to test this on at the moment, but I imagine the most sensible solution would be to cap this length so that the precision is always a known number, it should speed it up a bit too.

You could combine this with using doubles to store the temporary values, but if you’re going to take this performance hit then it may even be worth using the latest code from Harmony; they have fixed the main problem since I reported it, plus they have proper unit tests.

]]> By: Andre http://bitplane.net/2010/08/java-float-fast-parser/comment-page-1/#comment-404 Andre Wed, 23 Feb 2011 14:05:59 +0000 http://bitplane.net/?p=710#comment-404 CAREFUL! ... hallowed are Unit-tests! your code seems to be somewhat broken. Pls, try to parse "0.0093334345". It gives a float-value of 0.0661915 ... any suggestions? CAREFUL! … hallowed are Unit-tests!

your code seems to be somewhat broken. Pls, try to parse “0.0093334345″. It gives a float-value of 0.0661915

… any suggestions?

]]> By: Andre http://bitplane.net/2010/08/java-float-fast-parser/comment-page-1/#comment-403 Andre Thu, 17 Feb 2011 07:31:59 +0000 http://bitplane.net/?p=710#comment-403 Works great, thanks! One suggestion: One could also use CharSequence in the method declaration - in case someone has her own String-like implementation ... Works great, thanks!

One suggestion: One could also use CharSequence in the method declaration – in case someone has her own String-like implementation …

]]> By: Ian http://bitplane.net/2010/08/java-float-fast-parser/comment-page-1/#comment-369 Ian Sun, 19 Dec 2010 09:33:09 +0000 http://bitplane.net/?p=710#comment-369 Hi, Thanks for this investigation and code. I've used it to replace my Float.parseFloat in a file load operation, and this now takes a tenth of the time it did previously. Hi,

Thanks for this investigation and code. I’ve used it to replace my Float.parseFloat in a file load operation, and this now takes a tenth of the time it did previously.

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