Chapter 7: Concurrency

Question 1

ExecutorService method, Executes a Runnable task at some point in the future

Answer 1

void execute(Runnable command)

Question 2

ExecutorService method, executes a task at some point in the future and returns Future representing the task.

Answer 2

Future> submit(Runnable command)

Question 3

ExecutorService method, executes a Callable task at some point in the future and returns a Future representing the pending results of the task

Answer 3

Future submit(Callable task)

Question 4

ExecutorService, executes the given tasks, synchronously returning the result of all task as a Collection of Future objects, in the same order they were in the origina collection

Answer 4

List > invokeAll( Collection extends Callable> tasks throws InterruptedException

Question 5

ExecutorService method, Executes the given tasks, synchronously returning the result of one of finished tasks, cancelling any unfinished tasks

Answer 5

T invokeAny( Collection extends Callable> tasks) throws InterruptedException, ExecutionException

Question 6

Future method, returns true if task was completed

Answer 6

boolean isDone()

Question 7

Future method, returns true if the task was canceled before it completed normally

Answer 7

boolean isCancelled()

Question 8

Future method, attempts to cancel execution of the task

Answer 8

boolean cancel()

Question 9

Future method, retrieves the result of a task, waiting endlessly if it is not yet available

Answer 9

V get()

Question 10

Future method, retrieves the result of a task, waiting the specified amount of time.

Answer 10

V get(long timeout, TimeUnit unit)

Question 11

Enumerate the Synchronized Collections

Answer 11

Collections.synchronizedCollection();
Collections.synchronizedMap();
Collections.synchronizedSet();
Collections.synchronizedList();
Collections.synchronizedSortedMap();
Collections.synchronizedSortedList();
Collections.synchronizedNavigableMap();
Collections.synchronizedNavigableSet();