![]() At each invocation it removes the first element of the list and if the list is already empty it returns null but does not throw any exception. This method retrieves the value of the first element of the queue by removing it from the queue. You can rate examples to help us improve the quality of examples. however, if the list is empty element() throws a NoSuchElementException. These are the top rated real world Java examples of Queue.offer extracted from open source projects. Queue poll () method example in Java Java 8 Object Oriented Programming Programming Fetch and remove the first element in Queue using the poll () method. This method behaves like peek(), so it again retrieves the value of the first element without removing it. If the queue is empty the peek() method returns null. For each invocation of the method we always get the same value and its execution does not affect the size of the queue. This method retrieves the value of the first element of the queue without removing it from the queue. Producers will keep adding the items in a blocking queue, and the consumer will drain items, repeatedly, after some delay.The Queue interface defines some methods for acting on the first element of the list, which differ in the way they behave. To keep things simple, let us call the Producer and Consumer. We are creating two tasks to demonstrate the usage of the drainTo () method. Whatever ordering is used, the head of the queue is the element that would be removed by a call to remove or poll. Int drainTo(Collection c, int ma圎lements) The second method drains at most the ma圎lements number of available elements. Lets consider an example program on PriorityQueue to illustrate the methods of Queue interface.
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