Modifying locked object of a synchronization block

Question

Hi everyone,
Does someone know what happens if an object used as lock in a synchronization block, is modified into the same block?
Look to the belowe example to clarify my question:
Object out is modified into the synchronization block: other threads that try to executed another synchonization block (with out as lock object) become able to execute it because now the reference is changed?
Thank you very much in advance.
Diego
synchronized (out) {
          try {               
               out = new PrintStream (new FileOutputStream (file));
               out.println ();
          } catch (FileNotFoundException e) {
.................

Answer 1

DiegoCarzaniga wrote:
Thank you very much Kajbj.
This means that JAVA synchronization uses object references to implement locks... is it correct?No. A monitor lock is associated with an instance and not with the reference to an instance.
E.g.
Object lock = new Object();
Object sameLock = lock;Here lock and sameLock are referencing the same object and that object only has one monitor so you can either synchronize on lock or sameLock (but I would advise against it since it might cause confusion)
Kaj