How to get a binary size of a String(for example String s = "Ababa") in BITS(not bytes).
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2It is hard to tell without knowledge about encoding. Maybe tell us more about what do you need that for?Pshemo– Pshemo2012-07-07 14:11:41 +00:00Commented Jul 7, 2012 at 14:11
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2 Answers
In what encoding? The number of bits of a particular binary representation of a string is just the number of bytes * 8:
byte[] bytes = text.getBytes("UTF-8"); // Or whatever encoding you want
int bits = bytes.length * 8;
I don't think I've ever seen an encoding which allows fractions of a byte.
Note that if you're interested in UTF-16, you can just use text.length() * 16 as each char is a UTF-16 code unit.
8 Comments
Pablo Santa Cruz
Hi Jon, aren't Java strings internally represented by two-byte characters?
Jon Skeet
@PabloSantaCruz: Yes, but that's somewhat irrelevant - or at least, it's not what the OP asked. It's a very vague question at the moment.
Jon Skeet
@RobertKilar: Actually, my answer was before lxx's (14:07:37 vs 14:08:25) - not that it really matters. Pick the better answer; a minute either way isn't important.
Jon Skeet
@Ixx: On the other hand, it uses the platform-default encoding rather than specifying one, which is almost always the wrong approach. I definitely wouldn't use that code.
Jon Skeet
@Ixx: By "you would have set some encoding" - you mean change the system default? Ick, no thanks. I'd rather be explicit every time I want to use an encoding.
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get bytes, mutiply by 8...
"xxx".getBytes().length * 8;
Edit: merging with the answer of Jon Skeet, it's could be also important to specify the encoding, otherwise this will return the size using the system's default encoding, and that's not necessarily what you want to know. To know the size using a certain encoding, use:
"xxx".getBytes(encoding).length * 8;
encoding being "UTF-8", "ASCII", or whatever you want to use.
1 Comment
Pshemo
@RobertKilar If answer time of one question is 14min ago, and another 15 minutes ago which answer was earlier?
