The
poll(long timeout, TimeUnit unit) method of
BlockingQueue interface returns the head of BlockingQueue by removing that element from the queue. It can be said that this method retrieves and removes element from head of this LinkedBlockingQueue. If queue is empty, then poll() method will wait till a specified time for an element to become available.
Syntax:
public E poll(long timeout, TimeUnit unit) throws
Parameters: This method takes two mandatory parameters:
- timeout- how long to wait, in units of unit.
- unit- a TimeUnit for the timeout parameter.
Return Value: This method retrieves and removes element from head of this LinkedBlockingQueue, or null if the specified waiting time elapses before an element is available.
Exception This method throws
InterruptedException if method interrupted while waiting for an element to become available.
Note: The
poll() method of
BlockingQueue has been inherited from the
Queue class in Java.
Below programs illustrates poll(long timeout, TimeUnit unit) method of BlockingQueue:
Program 1:
Output:
Items in Queue are [Ravi, Suraj, Harsh]
Removing item From head: Ravi
Now Queue Contains[Suraj, Harsh]
Removing item From head: Suraj
Now Queue Contains[Harsh]
Removing item From head: Harsh
Now Queue Contains[]
Removing item From head: null
Now Queue Contains[]
Program 2:
