Java - Size of boolean type

08-16-2006, 06:59 AM

Hai,
Can anybody tell me the size of primitive data type boolean ?
I didn't get good answer by searching.
Thanks in advance
- Srinivasa Raju Datla

Srinivasa

08-16-2006, 07:19 AM

Srinivasa wrote:
> Hai,
> Can anybody tell me the size of primitive data type boolean ?
> I didn't get good answer by searching.
> Thanks in advance

It doesn't have a defined size. A Java implementation is free to store a
boolean in any fashion that it chooses.

Mike Schilling

08-16-2006, 07:22 AM

Thank you Mike

Mike Schilling wrote:
> Srinivasa wrote:
> > Hai,
> > Can anybody tell me the size of primitive data type boolean ?
> > I didn't get good answer by searching.
> > Thanks in advance
>
> It doesn't have a defined size. A Java implementation is free to store a
> boolean in any fashion that it chooses.

Srinivasa

08-16-2006, 04:03 PM

hi,
1 byte is the size of boolean type
Srinivasa wrote:
> Thank you Mike

>
> Mike Schilling wrote:
> > Srinivasa wrote:
> > > Hai,
> > > Can anybody tell me the size of primitive data type boolean ?
> > > I didn't get good answer by searching.
> > > Thanks in advance
> >
> > It doesn't have a defined size. A Java implementation is free to store a
> > boolean in any fashion that it chooses.

maruthisoft@gmail.com

08-16-2006, 04:19 PM

wrote:
> hi,
> 1 byte is the size of boolean type

Why do you say that? Can you prove that a JVM can't represent an array of
booleans using individual bits?

Mike Schilling

08-16-2006, 04:39 PM

Srinivasa wrote:
> Hai,
> Can anybody tell me the size of primitive data type boolean ?
> I didn't get good answer by searching.
> Thanks in advance
> - Srinivasa Raju Datla
>

It is up to the individual JVM implementation. It is possible that
different amounts of memory will be allocated in different situations.
However, the case that is both most interesting and most measurable is a
large boolean[] array.

I've previously measured it as one byte per element, rounded up to a
multiple of 8 and plus 8 bytes per array overhead. However, your mileage
may vary, and if you really need to know you should measure it on the
system you care about.

Patricia

Patricia Shanahan

08-16-2006, 07:19 AM	#2
Mike Schilling Posts: n/a	Re: Size of boolean type Srinivasa wrote: > Hai, > Can anybody tell me the size of primitive data type boolean ? > I didn't get good answer by searching. > Thanks in advance It doesn't have a defined size. A Java implementation is free to store a boolean in any fashion that it chooses. Mike Schilling

08-16-2006, 07:22 AM	#3
Srinivasa Posts: n/a	Re: Size of boolean type Thank you Mike Mike Schilling wrote: > Srinivasa wrote: > > Hai, > > Can anybody tell me the size of primitive data type boolean ? > > I didn't get good answer by searching. > > Thanks in advance > > It doesn't have a defined size. A Java implementation is free to store a > boolean in any fashion that it chooses. Srinivasa

08-16-2006, 04:03 PM	#4
maruthisoft@gmail.com Posts: n/a	Re: Size of boolean type hi, 1 byte is the size of boolean type Srinivasa wrote: > Thank you Mike > > Mike Schilling wrote: > > Srinivasa wrote: > > > Hai, > > > Can anybody tell me the size of primitive data type boolean ? > > > I didn't get good answer by searching. > > > Thanks in advance > > > > It doesn't have a defined size. A Java implementation is free to store a > > boolean in any fashion that it chooses. maruthisoft@gmail.com

08-16-2006, 04:19 PM	#5
Mike Schilling Posts: n/a	Re: Size of boolean type wrote: > hi, > 1 byte is the size of boolean type Why do you say that? Can you prove that a JVM can't represent an array of booleans using individual bits? Mike Schilling

08-16-2006, 04:39 PM	#6
Patricia Shanahan Posts: n/a	Re: Size of boolean type Srinivasa wrote: > Hai, > Can anybody tell me the size of primitive data type boolean ? > I didn't get good answer by searching. > Thanks in advance > - Srinivasa Raju Datla > It is up to the individual JVM implementation. It is possible that different amounts of memory will be allocated in different situations. However, the case that is both most interesting and most measurable is a large boolean[] array. I've previously measured it as one byte per element, rounded up to a multiple of 8 and plus 8 bytes per array overhead. However, your mileage may vary, and if you really need to know you should measure it on the system you care about. Patricia Patricia Shanahan

08-16-2006, 06:59 AM	#1
	Size of boolean type Hai, Can anybody tell me the size of primitive data type boolean ? I didn't get good answer by searching. Thanks in advance - Srinivasa Raju Datla Srinivasa

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