I always thought there were 8. And so the docs say, lol.
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/datatypes.html
But it seems our friends at JavaWorld might disagree:
http://www.javaworld.com/javaworld/jw-09-1996/jw-09-bytecodes.html?page=2
Are they just counting boolean as a byte? Or is it just an embarrassing typo?!
(If this is an interview trick question i'd like to know)
"...expressions in the Java programming language that operate on boolean values are compiled to use values of the Java virtual machine int data type."
Odd... wouldn't it save a few bytes of memory (3 to be exact) to use a byte? Not that one generally creates a large abundance of boolean's (in the source code, that is)
Message was edited by:
bsampieri
> "...expressions in the Java programming language that
> operate on boolean values are compiled to use values
> of the Java virtual machine int data type."
>
> Odd... wouldn't it save a few bytes of memory (3 to
> be exact) to use a byte? Not that one generally
> creates a large abundance of boolean's (in the source
> code, that is)
>
> Message was edited by:
> bsampieri
According to ronda's (now defunct for some reason) post, some JVMs use an int, some use a byte
> "...expressions in the Java programming language that
> operate on boolean values are compiled to use values
> of the Java virtual machine int data type."
>
> Odd... wouldn't it save a few bytes of memory (3 to
> be exact) to use a byte? Not that one generally
> creates a large abundance of boolean's (in the source
> code, that is)
You should have kept reading:
The Java virtual machine does directly support boolean arrays. Its newarray instruction enables creation of boolean arrays. Arrays of type boolean are accessed and modified using the byte array instructions baload and bastore.2
> According to ronda's (now defunct for some reason)
> post, some JVMs use an int, some use a byte
It looks like they blew up her account:
http://onesearch.sun.com/search/onesearch/index.jsp?col=developer-forums&subCat=siteforumid%3Ajava31&rt=false&site=dev&dftab=siteforumid%3Ajava31&chooseCat=javaall&advanced=true&required=&exact=&oneof=&exclude=+&cs=false&nh=10&since=&rf=0&doctypeAll=all&doctype=pdf&doctype=html&doctype=xml&doctype=plain&reslang=en&author=ronda
I searched for any posts authored by ronda in the advanced search, but there weren't any found.
> "...expressions in the Java programming language that
> operate on boolean values are compiled to use values
> of the Java virtual machine int data type."
Well, if that's the case, then why can't I do...
int i = 4;
if (i) {
System.out.println("See? Now Java rocks like C :)");
}
