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what is the result of trying to compile and run this program
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A. It fails to compile because the IllegalMonitorStateException of wait() is not dealt with in line 7. B. 1 2 3 C. 1 3 D. 1 2 E. At runtime, it throws an IllegalMonitorStateException when trying to wait. F.
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It will fail to compile because it has to be synchronized on the this object.
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13. Assume the following method is properly synchronized and called from a thread A on an object B:
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wait(2000);
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After calling this method, when will the thread A become a candidate to get another turn at the CPU
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A. After thread A is notified, or after two seconds. B. After the lock on B is released, or after two seconds. C. Two seconds after thread A is notified. D. Two seconds after lock B is released. 14. Which two are true A. The notifyAll() method must be called from a synchronized context. B. To call wait(), an object must own the lock on the thread. C. The notify() method is defined in class java.lang.Thread. D. When a thread is waiting as a result of wait(), it release its locks. E. The notify() method causes a thread to immediately release its locks. F.
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The difference between notify() and notifyAll() is that notifyAll() notifies all waiting threads, regardless of the object they re waiting on.
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15. Assume you create a program and one of your threads (called backgroundThread) does some lengthy numerical processing. What would be the proper way of setting its priority to try to get the rest of the system to be very responsive while the thread is running (Choose all that apply.) A. B. C. D. E. F. G.
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backgroundThread.setPriority(Thread.LOW_PRIORITY); backgroundThread.setPriority(Thread.MAX_PRIORITY); backgroundThread.setPriority(1); backgroundThread.setPriority(Thread.NO_PRIORITY); backgroundThread.setPriority(Thread.MIN_PRIORITY); backgroundThread.setPriority(Thread.NORM_PRIORITY); backgroundThread.setPriority(10);
16. Which three guarantee that a thread will leave the running state A. B. C. D.
yield() wait() notify() notifyAll()
9: Threads
E. sleep(1000) F. aLiveThread.join() G. Thread.killThread() 17. Which two are true A. Deadlock will not occur if wait()/notify() is used. B. A thread will resume execution as soon as its sleep duration expires. C. Synchronization can prevent two objects from being accessed by the same thread. D. The wait() method is overloaded to accept a duration. E. The notify() method is overloaded to accept a duration. F.
Both wait() and notify() must be called from a synchronized context.
G. wait() can throw a runtime exception H. sleep() can throw a runtime exception. 18. Which two are valid constructors for Thread A. B. C. D. E.
Thread(Runnable r, String name) Thread() Thread(int priority) Thread(Runnable r, ThreadGroup g) Thread(Runnable r, int priority)
19. Given the following,
class MyThread extends Thread { MyThread() { System.out.print(" MyThread"); } public void run() { System.out.print(" bar"); } public void run(String s) { System.out.println(" baz"); } } public class TestThreads { public static void main (String [] args) { Thread t = new MyThread() { public void run() {
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System.out.println(" foo"); } }; t.start(); } }
what is the result
A. B. C. D. E. F. G.
foo MyThread foo MyThread bar foo bar foo bar baz bar foo
Compilation fails.
20. Given the following,
public class SyncTest { public static void main (String [] args) { Thread t = new Thread() { Foo f = new Foo(); public void run() { f.increase(20); } }; t.start(); } } class Foo { private int data = 23; public void increase(int amt) { int x = data; data = x + amt; } }
and assuming that data must be protected from corruption, what if anything can you add to the preceding code to ensure the integrity of data
A. Synchronize the run method. B. Wrap a synchronize(this) around the call to f.increase().
9: Threads
C. The existing code will not compile. D. The existing code will cause a runtime exception. E. Put in a wait() call prior to invoking the increase() method. F.
Synchronize the increase() method
21. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. public class Test { public static void main (String [] args) { final Foo f = new Foo(); Thread t = new Thread(new Runnable() { public void run() { f.doStuff(); } }); Thread g = new Thread() { public void run() { f.doStuff(); } }; t.start(); g.start(); } } class Foo { int x = 5; public void doStuff() { if (x < 10) { // nothing to do try { wait(); } catch(InterruptedException ex) { } } else { System.out.println("x is " + x++); if (x >= 10) { notify(); } } } }
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