Simon Kitching wrote:.
* Class.getName returns strings that have been interned. I don't
think this is explicitly required by the java specs but is
certainly true for Sun's JVM and seems likely to be done by
any sensible JVM.
You definitely make some good arguments, but this one is not
neccesarily true. In fact, I'd argue a JVM that interns every
class' name (even if only on demand) is potentially wasting
a bunch of heap space.
I.e., is there something special about class names which means
they should be treated differently from any other String randomly
created and used in a Java application? (rhetorical question)
Otherwise, why not intern all Strings? Etc.
In any case, to provide two concrete counter-examples:
$ cat > zz.java
public class zz {
public static void main(String[] args) {
zz z = new zz();
System.out.println(z.getClass().getName() == "zz");
}
}
$ javac zz.java
$ java zz
true
$ jc -Xint zz
false
$ jamvm zz
false
On the other hand, comparing reference equality is very low cost,
so it seems like adding "==" to equals() might make good sense.
Of course, the "real" answer lies in empirical testing (something
I can't claim to have done).
-Archie
__________________________________________________________________________
Archie Cobbs * CTO, Awarix * http://www.awarix.com
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