![]() Queue stringQueue = new PriorityBlockingQueue() So, Let’s take an example of t he java queue program. The PriorityQueue and LinkedList are not thread-safe. PriorityBlockingQueue class implements the Queue interface and provides the thread-safe implementation of the queue. Size of queue: 3 PriorityBlockingQueue class Int removedElementByPoll = numbers.poll() ("Getting the by element() method: " + firstNumberByElement) Int firstNumberByElement = numbers.element() ("Getting the by peek() method: " + firstNumberByPeek) Also, Let’s take an example of the java queue program. In conclusion, It stores the elements in the contiguous memory location and maintains the insertion order of the element. LinkedList class is a very popular implementation of the Queue interface. ("Removing element by poll() method: " + removedElementByPoll) String removedElementByPoll = stringQueue.poll() Removing the head(First) element from queue by use of poll() method. ("Removing element by remove() method: " + removedElement) String removedElement = stringQueue.remove() Removing the head(First) element from queue by use of remove() method. ("Getting the by element() method: " + firstStringByElement) String firstStringByElement = stringQueue.element() Getting the head(First) element from queue by use of element() method. ("Getting the by peek() method: " + firstStringByPeek) String firstStringByPeek = stringQueue.peek() Getting the head(First) element from queue by use of peek() method. ("Elements from the queue: "+stringQueue) Adding some number/elements in queue by use of add() method Therefore, Let’s take an example of the java queue program import But sometimes it processes the element according to the priority. It is also works based on the First-In-First-Out algorithm. The PriorityQueue works based on priority and processes the objects. PriorityQueue extends the AbstarctQueue that implements the Queue interface. There are some classes that provide the implementation to the queue interface. size() method: This method returns the number of elements present in the queue. Hence, If the queue is empty it will return null.Ħ. Another, It is very similar to remove() method. This method is also used to remove and get the head(First) element from the queue. If a queue is empty it will throw NoSuchElementException. This method also utilizes to remove and get the head(First) element from the queue. But, If the queue empty, it will throw NoSuchElementException. If the queue is empty it will return null.Īnother, This method also use to get the head(First) element of the queue without removing it. This method employs to get the head(First) element of the queue without removing it. But in PriorityQueue, the element will be added according to the priority in case of priority queue implementation. In LinkedList, the element will be added at the last. In both classes add method work differently. So, As you know the Queue interface is implemented by PriorityQueue and LinkedList. This method uses to add the element in the Queue, it adds the element at the tail(Rear). BlockingQueue is the thread-safe implementation of Queue and it doesn’t accept any null element. LinkedList, PriorityQueue, and ArrayBlockingQueue are the most frequently used Queue implementations.Ĥ. It supports all methods of Collection interface.ģ. Java Queue represents an ordered list of elements. In queue inserts elements at the end and removes them from the beginning.Ģ. Java Queue is just like a real-world queue, It is based on FIFO (First In First Out). Java queue class diagram Important points about Java Queueġ. PriorityQueue and LinkedList class are not thread-safe But there is another alternative implementation that is PriorityBlockingQueue which is thread-safe. The Queue interface has its implementation in PriorityQueueand the LinkedList class is also implementing it through the Deque. In Queue the element inserts at the end of the list and deleting elements from the start of the list. Java queue is a collection that is used to hold the elements and perform various operations like insertion, removal, etc. In FIFO, the first element removes first, and the last element removes at last. Java queue maintains the orders of the elements in FIFO(First In First Out) manner. ![]() Queue interface in java extends the collection interface and it is available in java.util package.
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