Question 1

An ExecutorService object is created by calling a static method of which class?

Accepted Answer

A)  Executor.
B)  Executors.
C)  ExecutorService.
D)  Thread.E) A) and C)
F) A) and D)

Question 2

The preferred means of creating multithreaded Java applications is by implementing the ________ interface.An object of a class that implements this interface represents a task to perform.

Accepted Answer

A)  Thread.
B)  Runner.
C)  Runnable.
D)  None of the above.E) B) and D)
F) None of the above

Question 3

Which one of the following statements is true with regard to a producer/consumer relationship with one producer and one consumer?

Accepted Answer

A)  A producer can never produce faster than the consumer is consuming.
B)  A consumer can never consume faster than the producer is producing.
C)  A producer can produce more items than a consumer consumes.
D)  A consumer can consume more items than a producer produces.E) All of the above
F) C) and D)

Question 4

The BlockingQueue interface declares which two methods for blocked adding and blocked removing of elements from a circular buffer?

Accepted Answer

A)  put and take.
B)  add and remove.
C)  push and pop.
D)  place and get.E) A) and C)
F) A) and B)

Question 5

In a producer/consumer relationship,the ________ portion of an application generates data and stores it in a shared object,and the ________ portion of an application reads data from the shared object.

Accepted Answer

A)  consumer,producer.
B)  producer,consumer.
C)  outputter,inputter.
D)  None of the above.E) B) and D)
F) All of the above B

Question 6

When a thread executing a synchronized statement (or method) completes or satisfies the condition on which another thread may be waiting,it can call Object method ________ or ________ to allow a waiting thread or all waiting threads to transition to the runnable state again.

Accepted Answer

A)  notifyThread,notifyAllThreads.
B)  wakeUpThread,wakeUpAllThreads.
C)  notify,notifyAll.
D)  None of the above.E) A) and C)
F) B) and C)

Question 7

This class is used to help implement mutual exclusion.

Accepted Answer

A)  MutEx.
B)  Condition.
C)  Lock.
D)  Signal.E) C) and D)
F) B) and C)

Question 8

When a thread obtains the monitor lock on an object,then determines that it cannot continue with its task on that object until some condition is satisfied,the thread can call Object method ________;this releases the monitor lock on the object,and transitions the thread waits to the waiting state.

Accepted Answer

A)  waitForOtherThreads.
B)  stop.
C)  waitForCondition.
D)  wait.E) B) and C)
F) None of the above

Question 9

When using Java's built-in monitors,every object has a(n) ________ or a(n) ________ that the monitor ensures is held by a maximum of only one thread at any time.

Accepted Answer

A)  monitor lock,intrinsic lock.
B)  built-in lock,free lock.
C)  mutual exlcusion lock,synchronization lock.
D)  None of the above.E) A) and D)
F) B) and D)

Question 10

If a thread calls __________,then every thread waiting for the object becomes eligible to acquire the lock.

Accepted Answer

A)  signalEach.
B)  signalAll.
C)  signal.
D)  signalMethods.E) B) and D)
F) None of the above

Question 11

You can simulate atomicity by ensuring that ________.

Accepted Answer

A)  at least one thread carries out its operations on an object at a time.
B)  two threads carry out their operations on an object in parallel.
C)  only one thread carries out its operations on an object at a time.
D)  None of the above.E) All of the above
F) None of the above

Question 12

A new thread begins its life cycle by transitioning to the __________ state.

Accepted Answer

A)  runnable.
B)  waiting.
C)  terminated.
D)  new.E) A) and B)
F) None of the above

Question 13

With timeslicing,each thread is given a limited amount of time,called a __________,to execute on a processor.

Accepted Answer

A)  Quantum.
B)  Processor burst.
C)  Time allocation.
D)  Scheduling interval.E) B) and C)
F) None of the above

Question 14

In a producer/consumer relationship with a single cell of shared memory,which of the following is true?

Accepted Answer

A)  The consumer must run first.
B)  The producer must run first.
C)  The producer must run first or the consumer will have to wait.
D)  The consumer must run first or the producer will have to wait.E) All of the above
F) B) and C)

Question 15

Interface ExecutorService provides the ________ method,which returns control to its caller either when all tasks executing in the ExecutorService complete or when the specified timeout elapses.

Accepted Answer

A)  waitForTermination.
B)  wait.
C)  awaitTermination.
D)  None of the above.E) A) and B)
F) A) and C)

Question 16

When a __________ method or block is running on an object,the object is locked so no other such method can run on that object at the same time.

Accepted Answer

A)  synchronized.
B)  shared.
C)  thread.
D)  writeable.E) A) and C)
F) B) and C)

Question 17

The Callable interface declares this method.

Accepted Answer

A)  get.
B)  call.
C)  run.
D)  execute.E) A) and B)
F) C) and D) B

Question 18

Which of the following is not true of ExecutorService?

Accepted Answer

A)  It is a subinterface of Executor.
B)  It is an object that can be run in a separate thread.
C)  It declares method shutdown.
D)  It manages a group of threads.E) A) and B)
F) C) and D)

Question 19

The main method executes in the ________ thread of execution.

Accepted Answer

A)  starting
B)  main
C)  local
D)  None of the above.E) B) and C)
F) A) and D) B

Question 20

In a producer/consumer relationship,when a consumer finds the buffer empty or finds that the previous data has already been read,the consumer should call __________.

Accepted Answer

A)  lock.
B)  signal.
C)  sleep.
D)  await.E) A) and C)
F) A) and B)

Exam 26: Multithreading

An ExecutorService object is created by calling a static method of which class?

Correct AnswerverifiedShow Answer

The preferred means of creating multithreaded Java applications is by implementing the ________ interface.An object of a class that implements this interface represents a task to perform.

Correct AnswerverifiedShow Answer

Which one of the following statements is true with regard to a producer/consumer relationship with one producer and one consumer?

Correct AnswerverifiedShow Answer

The BlockingQueue interface declares which two methods for blocked adding and blocked removing of elements from a circular buffer?

Correct AnswerverifiedShow Answer

In a producer/consumer relationship,the ________ portion of an application generates data and stores it in a shared object,and the ________ portion of an application reads data from the shared object.

Correct AnswerverifiedB

When a thread executing a synchronized statement (or method) completes or satisfies the condition on which another thread may be waiting,it can call Object method ________ or ________ to allow a waiting thread or all waiting threads to transition to the runnable state again.

Correct AnswerverifiedShow Answer

This class is used to help implement mutual exclusion.

Correct AnswerverifiedShow Answer

When a thread obtains the monitor lock on an object,then determines that it cannot continue with its task on that object until some condition is satisfied,the thread can call Object method ________;this releases the monitor lock on the object,and transitions the thread waits to the waiting state.

Correct AnswerverifiedShow Answer

When using Java's built-in monitors,every object has a(n) ________ or a(n) ________ that the monitor ensures is held by a maximum of only one thread at any time.

Correct AnswerverifiedShow Answer

If a thread calls __________,then every thread waiting for the object becomes eligible to acquire the lock.

Correct AnswerverifiedShow Answer

You can simulate atomicity by ensuring that ________.

Correct AnswerverifiedShow Answer

A new thread begins its life cycle by transitioning to the __________ state.

Correct AnswerverifiedShow Answer

With timeslicing,each thread is given a limited amount of time,called a __________,to execute on a processor.

Correct AnswerverifiedShow Answer

In a producer/consumer relationship with a single cell of shared memory,which of the following is true?

Correct AnswerverifiedShow Answer

Interface ExecutorService provides the ________ method,which returns control to its caller either when all tasks executing in the ExecutorService complete or when the specified timeout elapses.

Correct AnswerverifiedShow Answer

When a __________ method or block is running on an object,the object is locked so no other such method can run on that object at the same time.

Correct AnswerverifiedShow Answer

The Callable interface declares this method.

Correct AnswerverifiedB

Which of the following is not true of ExecutorService?

Correct AnswerverifiedShow Answer

The main method executes in the ________ thread of execution.

Correct AnswerverifiedB

In a producer/consumer relationship,when a consumer finds the buffer empty or finds that the previous data has already been read,the consumer should call __________.

Correct AnswerverifiedShow Answer

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In a producer/consumer relationship,the portion of an application generates data and stores it in a shared object,and the portion of an application reads data from the shared object.

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B

When a thread executing a synchronized statement (or method) completes or satisfies the condition on which another thread may be waiting,it can call Object method or to allow a waiting thread or all waiting threads to transition to the runnable state again.

Correct Answer
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When using Java's built-in monitors,every object has a(n) or a(n) that the monitor ensures is held by a maximum of only one thread at any time.

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B

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B

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