Question 1

Which of the following is true for a correct producer/consumer relationship with one producer,one consumer,and a 5-cell buffer?

Accepted Answer

A) The producer can produce when all cells are full. 
B) The consumer can consume when all cells are full. 
C) The consumer can consume when all cells are empty. 
D) None of the above. 
A) The producer can produce when all cells are full. 
B) The consumer can consume when all cells are full. 
C) The consumer can consume when all cells are empty. 
D) None of the above. B

Question 2

23)2.2.A waiting thread transitions back to the ________ state only when another thread notifies it to continue executing.

Accepted Answer

A) runnable 
B) terminated 
C) new 
D) blocked 
A) runnable 
B) terminated 
C) new 
D) blocked A

Question 3

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

Question 4

Which of the following statements is false?

Accepted Answer

A) Java makes concurrency available to you through the language and APIs. 
B) Concurrency is a subset of parallelism. 
C) Today's multi-core computers have multiple processors that can perform tasks in parallel. 
D) Java programs can have multiple threads of execution,where each thread has its own method-call stack and program counter,allowing it to execute concurrently with other threads.This capability is called multithreading. 
A) Java makes concurrency available to you through the language and APIs. 
B) Concurrency is a subset of parallelism. 
C) Today's multi-core computers have multiple processors that can perform tasks in parallel. 
D) Java programs can have multiple threads of execution,where each thread has its own method-call stack and program counter,allowing it to execute concurrently with other threads.This capability is called multithreading.

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. 
A) consumer,producer 
B) producer,consumer 
C) outputter,inputter 
D) None of the above.

Question 6

Which of the following statements is false?

Accepted Answer

A) A common way to perform synchronization is to use Java's built-in monitors. 
B) Every object has a monitor and a monitor lock (or intrinsic lock). 
C) A monitor ensures that its object's monitor lock is held by a maximum of two threads at a time. 
D) Monitors and monitor locks can be used to enforce mutual exclusion. 
A) A common way to perform synchronization is to use Java's built-in monitors. 
B) Every object has a monitor and a monitor lock (or intrinsic lock). 
C) A monitor ensures that its object's monitor lock is held by a maximum of two threads at a time. 
D) Monitors and monitor locks can be used to enforce mutual exclusion.

Question 7

The main method executes in the ________ thread of execution.

Accepted Answer

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

Question 8

Which of the following statements is false?

Accepted Answer

A) In a multithreaded application,threads can be distributed across multiple processors (if available)so that multiple tasks execute in parallel and the application can operate more efficiently. 
B) The JVM creates threads to run a program and for housekeeping tasks such as garbage collection. 
C) Multithreading can increase performance only on multi-core systems. 
D) The vast majority of programmers should use existing collection classes and interfaces from the concurrency APIs that manage synchronization for you. 
A) In a multithreaded application,threads can be distributed across multiple processors (if available)so that multiple tasks execute in parallel and the application can operate more efficiently. 
B) The JVM creates threads to run a program and for housekeeping tasks such as garbage collection. 
C) Multithreading can increase performance only on multi-core systems. 
D) The vast majority of programmers should use existing collection classes and interfaces from the concurrency APIs that manage synchronization for you.

Question 9

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

Accepted Answer

A) runnable. 
B) waiting. 
C) terminated. 
D) new. 
A) runnable. 
B) waiting. 
C) terminated. 
D) new.

Question 10

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. 
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.

Question 11

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. 
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.

Question 12

SwingWorker method ________ executes a long computation in a worker thread.

Accepted Answer

A) execute. 
B) performCalculation. 
C) doInBackground. 
D) None of the above. 
A) execute. 
B) performCalculation. 
C) doInBackground. 
D) None of the above.

Question 13

To determine the difference between two Instants,use class Duration's static method ________,which returns a Duration object containing the time difference.

Accepted Answer

A) difference 
B) interval 
C) between 
D) span 
A) difference 
B) interval 
C) between 
D) span

Question 14

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 
A) waitForOtherThreads 
B) stop 
C) waitForCondition 
D) wait

Question 15

Arrays static method ________ fills an array with values produced by a generator function that receives an int and returns a value of type int,long or double.

Accepted Answer

A) parallelFill 
B) parallelFillAll 
C) generateAll 
D) parallelSetAll 
A) parallelFill 
B) parallelFillAll 
C) generateAll 
D) parallelSetAll

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 
A) synchronized 
B) shared 
C) thread 
D) writeable

Question 17

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

Accepted Answer

A) Executor. 
B) Executors. 
C) ExecutorService. 
D) Thread. 
A) Executor. 
B) Executors. 
C) ExecutorService. 
D) Thread.

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. 
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.

Question 19

Two tasks that are operating ________ are executing simultaneously.

Accepted Answer

A) concurrently 
B) in parallel 
C) sequentially 
D) iteratively 
A) concurrently 
B) in parallel 
C) sequentially 
D) iteratively

Question 20

Which of the following statements is false?

Accepted Answer

A) A runnable thread transitions to the blocked state when it attempts to perform a task that cannot be completed immediately and it must temporarily wait until that task completes. 
B) When a thread issues an input/output request,the operating system blocks the thread from executing until that I/O request completes-at that point,the blocked thread transitions to the runnable state,so it can resume execution. 
C) A blocked thread cannot use a processor,even if one is available. 
D) Each of the above statements is true. 
A) A runnable thread transitions to the blocked state when it attempts to perform a task that cannot be completed immediately and it must temporarily wait until that task completes. 
B) When a thread issues an input/output request,the operating system blocks the thread from executing until that I/O request completes-at that point,the blocked thread transitions to the runnable state,so it can resume execution. 
C) A blocked thread cannot use a processor,even if one is available. 
D) Each of the above statements is true.

Exam 23: Concurrency

Which of the following is true for a correct producer/consumer relationship with one producer,one consumer,and a 5-cell buffer?

23)2.2.A waiting thread transitions back to the ________ state only when another thread notifies it to continue executing.

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

Which of the following statements is false?

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.

Which of the following statements is false?

The main method executes in the ________ thread of execution.

Which of the following statements is false?

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

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

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

SwingWorker method ________ executes a long computation in a worker thread.

To determine the difference between two Instants,use class Duration's static method ________,which returns a Duration object containing the time difference.

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.

Arrays static method ________ fills an array with values produced by a generator function that receives an int and returns a value of type int,long or double.

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.

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

Which of the following is not true of ExecutorService?

Two tasks that are operating ________ are executing simultaneously.

Which of the following statements is false?

Introduction to Computers and Java

Introduction to Java Applications

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Methods: a Deeper Look

Arrays and Arraylists

Classes and Objects: a Deeper Look

Object Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Exception Handling

Gui Components: Part 1

Graphics and Java 2D

Strings

Files,streams and Object Serialization

Generic Collections

Lambdas

Recursion

Searching, Sorting and Big O

Generic Classes and Methods

Custom Generic Data Structures

Accessing Databases With Jdbc

JavaFX

Filters

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.