About Question enthuware.ocpjp.v7.2.1343 :

[muttley]

Hi, I think that in this question have a little mistake in the explanation.
instead of:
"Second thread acquires the lock of sb2 and appends Y to sb2."
could be:
"Second thread acquires the lock of sb2 and appends Y to sb1."
What do you think?

thanks in advance.

[admin]

Actually, in the second thread, sb1.append("Y"); should actually be sb2.append("Y"); and sb2.append("X"); should be sb1.append("X");

This has now been fixed.

thank you for your feedback!
Paul.