>>479
言語規約がどうなのか気になるのならそれを調べればいいだけじゃないでしょうか
このへんでしょうか
http://java.sun.com/docs/books/jls/third_edition/html/memory.html
> Only one thread at a time may hold a lock on a monitor.
> Any other threads attempting to lock that monitor are blocked until they can obtain a lock on that monitor.