java pdf 417 reader 9: Threads in Java

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9: Threads
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12. D. 1 and 2 will be printed, but there will be no return from the wait call because no other thread will notify the main thread, so 3 will never be printed. The program is essentially frozen at line 7. A is incorrect; IllegalMonitorStateException is an unchecked exception so it doesn t have to be dealt with explicitly. B and C are incorrect; 3 will never be printed, since this program will never terminate because it will wait forever. E is incorrect because IllegalMonitorStateException will never be thrown because the wait() is done on args within a block of code synchronized on args. F is incorrect because any object can be used to synchronize on and, furthermore, there is no this when running a static method. 13. A. Either of the two events (notification or wait time expiration) will make the thread become a candidate for running again. B is incorrect because a waiting thread will not return to runnable when the lock is released, unless a notification occurs. C is incorrect because the thread will become a candidate immediately after notification, not two seconds afterwards. D is also incorrect because a thread will not come out of a waiting pool just because a lock has been released. 14. A and D. A is correct because the notifyAll() method (along with wait() and notify()) must always be called from within a synchronized context. D is correct because a thread blocked on a wait() call releases its locks, so another thread can get into the synchronized code and eventually call notify() or notifyAll(). B is incorrect because to call wait(), the thread must own the lock on the object that wait() is being invoked on, not the other way around. C is wrong because notify() is defined in java.lang.Object. E is wrong because notify() will not cause a thread to release its locks. The thread can only release its locks by exiting the synchronized code. F is wrong because notifyAll() notifies all the threads waiting on a particular locked object, not all threads waiting on any object. 15. C and E. In E, the constant Thread.MIN_PRIORITY is the lowest priority that a thread can have, and the background thread should have a very low priority or the lowest. Answer C is correct because 1 is a low (and usually the minimum) value, although for code clarity it is recommended to use the Thread.MIN_PRIORITY. A and D are incorrect because there are no such variables in the Thread class. B is incorrect; using MAX_PRIORITY would make other threads have fewer chances of getting a turn of the CPU, even to the point of freezing until the numerical processing is finished. F is incorrect because the thread would still compete for the CPU time and even delay other threads. G is incorrect because 10 is the value of MAX_PRIORITY, so i would be equivalent to answer B.
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16. B, E, and F. B is correct because wait() always causes the current thread to go into the object s wait pool. E is correct because sleep() will always pause the currently running thread for at least the duration specified in the sleep argument (unless an interrupted exception is thrown). F is correct because, assuming that the thread you re calling join() on is alive, the thread calling join() will immediately block until the thread you re calling join() on is no longer alive. A is wrong, but tempting. The yield() method is not guaranteed to cause a thread to leave the running state, although if there are runnable threads of the same priority as the currently running thread, then the current thread will probably leave the running state. C and D are incorrect because they don t cause the thread invoking them to leave the running state. G is wrong because there s no such method. 17. D and F. D is correct because the wait() method is overloaded to accept a wait duration in milliseconds. If the thread has not been notified by the time the wait duration has elapsed, then the thread will move back to runnable even without having been notified. F is correct because wait()/notify()/notifyAll() must all be called from within a synchronized, context. A thread must own the lock on the object its invoking wait()/notify()/notifyAll() on. A is incorrect because wait()/notify() will not prevent deadlock. B is incorrect because a sleeping thread will return to runnable when it wakes up, but it might not necessarily resume execution right away. To resume executing, the newly awakened thread must still be moved from runnable to running by the scheduler. C is incorrect because synchronization prevents two or more threads from accessing the same object. E is incorrect because notify() is not overloaded to accept a duration. G and H are incorrect because wait() and sleep() both declare a checked exception (InterruptedException). 18. A and B are both valid constructors for Thread. C, D, and E are not legal Thread constructors, although D is close. If you reverse the arguments in D, you d have a valid constructor. 19. B is correct because in the first line of main we re constructing an instance of an anonymous inner class extending from MyThread. So the MyThread constructor runs and prints MyThread . The next statement in main invokes start() on the new thread instance, which causes the overridden run() method (the run() method defined in the anonymous inner class) to be invoked, which prints foo . A, C, D, E, F, and G are all incorrect because of the program logic described above.
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