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| From | Jim Janney <jjanney@shell.xmission.com> |
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: creating byte[] with subfields |
| Date | Fri, 18 Jan 2013 10:29:42 -0700 |
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Jim Janney <jjanney@shell.xmission.com> writes: > Roedy Green <see_website@mindprod.com.invalid> writes: > >> I often have to construct byte arrays with binary fields, or read >> them. >> >> I use a ByteArrayOutputStream and a DataOutputStream to compose them. >> I wondered if there is a simpler way, one that does not require >> computing each byte individually with shifts. > > In C, sure. Java by design doesn't allow those kinds of tricks. The hotspot compiler might notice that you're shifting and masking by 8 bits and replace it with direct byte addressing. That seems like a straightforward optimization. OTOH, the speed difference is probably too tiny to notice anyway. -- Jim Janney
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creating byte[] with subfields Roedy Green <see_website@mindprod.com.invalid> - 2013-01-18 00:35 -0800
Re: creating byte[] with subfields Jim Janney <jjanney@shell.xmission.com> - 2013-01-18 08:31 -0700
Re: creating byte[] with subfields Jim Janney <jjanney@shell.xmission.com> - 2013-01-18 10:29 -0700
Re: creating byte[] with subfields Nigel Wade <nmw@ion.le.ac.uk> - 2013-01-18 16:23 +0000
Re: creating byte[] with subfields Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-01-18 10:53 -0800
Re: creating byte[] with subfields Roedy Green <see_website@mindprod.com.invalid> - 2013-01-18 14:23 -0800
Re: creating byte[] with subfields Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-01-18 15:16 -0800
Re: creating byte[] with subfields Roedy Green <see_website@mindprod.com.invalid> - 2013-01-18 23:24 -0800
Re: creating byte[] with subfields Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-01-19 21:46 -0800
Re: creating byte[] with subfields Joshua Cranmer <Pidgeot18@verizon.invalid> - 2013-01-20 11:01 -0600
Re: creating byte[] with subfields Arne Vajhøj <arne@vajhoej.dk> - 2013-01-20 12:54 -0500
Re: creating byte[] with subfields Arne Vajhøj <arne@vajhoej.dk> - 2013-01-20 12:51 -0500
Re: creating byte[] with subfields Arne Vajhøj <arne@vajhoej.dk> - 2013-01-19 13:34 -0500
Re: creating byte[] with subfields Arne Vajhøj <arne@vajhoej.dk> - 2013-01-18 20:33 -0500
Re: creating byte[] with subfields Arne Vajhøj <arne@vajhoej.dk> - 2013-01-18 20:48 -0500
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