If a Thread's priority is not specified explicitly then it gets a priority of Thread.NORM_PRIORITY.
I answered true, but jqplus response was false because:
"Similar question has been asked in SCJP2. In such a case, the Thread gets the same priority as the thread that has created it. So if a thread t1 having a priority Thread.MAX_PRIORITY creates a thread t2, t2 will also get a priority of Thread.MAX_PRIORITY......"
I remember something about on K&B saying that a new thread always has NORM_PRIORITY.
I also tried this code that print 10(Maxpriority (I know that depends on JVM)) 5 (norm_priority )".
Quick tip: when you find yourself needing answers to queries like this one, you may find it a lot faster to check out the API javadoc for the class in question.
For example, here's the appropriate paragraph from the Thread javadoc:
"When code running in some thread creates a new Thread object, the new thread has its priority initially set equal to the priority of the creating thread, and is a daemon thread if and only if the creating thread is a daemon."