Re: [Jython-users] Use of interned strings in various jython methods

[David H. <dav...@gm...>]

On Mon, Mar 31, 2008 at 3:33 PM, mgreenberg <pub...@gm...> wrote:
> According to various javadoc and code usage, various methods require the
>  use of interned strings.  I grepped the 2.2.1 release
>  code base and see various lines like
>
>  if (name == "__class__")
>
>  But don't see anywhere obvious that "__class__" gets interned (but
>  presumably it does -- is that implicit in classes in a single jar or
>  something?).

String literals in Java source code get interned.

>From http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.5:

"# Literal strings within the same class (§8) in the same package (§7)
represent references to the same String object (§4.3.1).
# Literal strings within different classes in the same package
represent references to the same String object.
# Literal strings within different classes in different packages
likewise represent references to the same String object.
# Strings computed by constant expressions (§15.28) are computed at
compile time and then treated as if they were literals.
# Strings computed by concatenation at run time are newly created and
therefore distinct. "

- David