Threading, Java

Threading

Question: Which method registers a thread in a thread scheduler?
A
run();

B
construct();

C
start();

D
register();

Note: Option C is correct. The start() method causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread. Option A is wrong. The run() method of a thread is like the main() method to an application. Starting the thread causes the object's run method to be called in that separately executing thread. Option B is wrong. There is no construct() method in the Thread class. Option D is wrong. There is no register() method in the Thread class.
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Question: Assume the following method is properly synchronized and called from a thread A on an object B: wait(2000); After calling this method, when will the thread A become a candidate to get another turn at the CPU?
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.

Note: Option A. Either of the two events (notification or wait time expiration) will make the thread become a candidate for running again. Option B is incorrect because a waiting thread will not return to runnable when the lock is released, unless a notification occurs. Option C is incorrect because the thread will become a candidate immediately after notification, not two seconds afterwards. Option D is also incorrect because a thread will not come out of a waiting pool just because a lock has been released.
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Question: Which of the following will not directly cause a thread to stop?
A
notify()

B
wait()

C
InputStream access

D
sleep()

Note: Option A is correct. notify() - wakes up a single thread that is waiting on this object's monitor. Option B is wrong. wait() causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. Option C is wrong. Methods of the InputStream class block until input data is available, the end of the stream is detected, or an exception is thrown. Blocking means that a thread may stop until certain conditions are met. Option D is wrong. sleep() - Causes the currently executing thread to sleep (temporarily cease execution) for a specified number of milliseconds. The thread does not lose ownership of any monitors.
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Question: Which class or interface defines the wait(), notify(),and notifyAll() methods?
A
Object

B
Thread

C
Runnable

D
Class

Note: The Object class defines these thread-specific methods. Option 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.
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Question:
public class MyRunnable implements Runnable { public void run() { // some code here } }
which of these will create and start this thread?
A
new Runnable(MyRunnable).start();

B
new Thread(MyRunnable).run();

C
new Thread(new MyRunnable()).start();

D
new MyRunnable().start();

Note: 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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Question: Which method registers a thread in a thread scheduler?

Question: Assume the following method is properly synchronized and called from a thread A on an object B: wait(2000); After calling this method, when will the thread A become a candidate to get another turn at the CPU?

Question: Which of the following will not directly cause a thread to stop?

Question: Which class or interface defines the wait(), notify(),and notifyAll() methods?

Question:
public class MyRunnable implements Runnable { public void run() { // some code here } }
which of these will create and start this thread?

Question: Which method registers a thread in a thread scheduler?

Question: Assume the following method is properly synchronized and called from a thread A on an object B: wait(2000); After calling this method, when will the thread A become a candidate to get another turn at the CPU?

Question: Which of the following will not directly cause a thread to stop?

Question: Which class or interface defines the wait(), notify(),and notifyAll() methods?

Question: public class MyRunnable implements Runnable { public void run() { // some code here } } which of these will create and start this thread?

Question:
public class MyRunnable implements Runnable { public void run() { // some code here } }
which of these will create and start this thread?