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A. The code will not compile because of an error on line 12 of class Foo. B. The code will not compile because of an error on line 7 of class Foo. C. The code will not compile because of an error on line 4 of class Test. D. The code will not compile because of some other error in class Test. E. An exception occurs at runtime. F.
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1. C. Line 5 calls the run() method, so the run() method executes as a normal method should. A is incorrect because line 4 is the proper way to create an object. B is incorrect because it is legal to call the run() method, even though this will not start a true thread of execution. The code after line 5 will not execute until the run() method is complete. D is incorrect because the for loop only does two iterations. E is incorrect because the program runs without exception. 2. A and D. Only start() and run() are defined by the Thread class. B and C are incorrect because they are methods of the Object class. E is incorrect because there s no such method in any thread-related class. 3. C. The class correctly implements the Runnable interface with a legal public void run() method. A is incorrect because interfaces are not extended; they are implemented. B is incorrect because even though the class would compile and it has a valid public void run() method, it does not implement the Runnable interface, so the compiler would complain when creating a Thread with an instance of it. D is incorrect because the run() method must be public. E is incorrect because the method to implement is run(), not start(). 4. B. When the start() method is attempted a second time on a single Thread object, the method will throw an IllegalThreadStateException (you will not need to know this exception name for the exam). Even if the thread has finished running, it is still illegal to call start() again. A is incorrect because compilation will succeed. For the most part, the Java compiler only checks for illegal syntax, rather than class-specific logic. C and D are incorrect because of the logic explained above. 5. C. Because the class implements Runnable, an instance of it has to be passed to the Thread constructor, and then the instance of the Thread has to be started. A is incorrect. There is no constructor like this for Runnable because Runnable is an interface, and it is illegal to pass a class or interface name to any constructor. B is incorrect for the same reason; you can t pass a class or interface name to any constructor. D is incorrect because MyRunnable doesn t have a start() method, and the only start() method that can start a thread of execution is the start() in the Thread class.
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6. D. The thread MyThread will start and loop three times (from 0 to 2). A is incorrect because the Thread class implements the Runnable interface; therefore, in line 5, Thread can take an object of type Thread as an argument in the constructor. B and C are incorrect because the variable i in the for loop starts with a value of 0 and ends with a value of 2. E is incorrect because of the program logic described above. 7. D. The sleep() method must be enclosed in a try/catch block, or the method printAll() must declare it throws the InterruptedException. A is incorrect, but it would be correct if the InterruptedException was dealt with. B is incorrect, but it would still be incorrect if the InterruptedException was dealt with because all Java code, including the main() method, runs in threads. C is incorrect. The sleep() method is static, so even if it is called on an instance, it still always affects the currently executing thread. 8. B and F. By marking the methods as synchronized, the threads will get the lock of the this object before proceeding. Only one thread will be either setting or reading at any given moment, thereby assuring that read() always returns the addition of a valid pair. A is incorrect because it is not synchronized; therefore, there is no guarantee that the values added by the read() method belong to the same pair. C and D are incorrect; only objects can be used to synchronize on. E is incorrect because it is not possible to select other objects to synchronize on when declaring a method as synchronized. Even using this is incorrect syntax. 9. A. The Object class defines these thread-specific methods. B, C, and D are incorrect because they do not define these methods. And yes, the Java API does define a class called Class, though you do not need to know it for the exam. 10. B and E. B is correct because multiple threads are allowed to enter nonsynchronized code, even within a class that has some synchronized methods. E is correct because a wait() call causes the thread to give up its locks. A is incorrect because static methods can be synchronized; they synchronize on the lock on the instance of class java.lang.Class that represents the class type. C is incorrect because only methods not variables can be marked synchronized. D is incorrect because a sleeping thread still maintains its locks. 11. A, B, and F. They are all related to the list of threads waiting on the specified object. C, E, G, and H are incorrect answers. The methods isInterrupted() and interrupt() are instance methods of Thread. The methods sleep() and yield() are static methods of Thread. D is incorrect because synchronized is a keyword and the synchronized() construct is part of the Java language.
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