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It returns true if the queue is empty, else false.
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This method is used to check if the queue is empty or not. This method is used to return the hashcode value of the given queue. This method is used to compare the equality of the given element with the elements of the queue. This method returns the last occurrence of the given element or -1 if the element is not present in the queue. This method returns the first occurrence of the given element or -1 if the element is not present in the queue. This function returns the element which was just replaced by a new element. This method replaces elements at a given index with the new element. This method returns elements at the specified index. This method is used to remove and return the first occurrence of the given element in the queue. It shifts subsequent elements(if any) to left and decreases their indexes by 1. This method removes an element from the specified index. However, the reference of the queue created is still stored.
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This method is used to remove all the elements in the queue. This method is used to return the size of the queue. When a single parameter is passed, it adds all the elements of the given collection at the end of the queue. This method is used to add all the elements in the given collection to the queue. When a single parameter is passed, it simply adds the element at the end of the queue. This method is used to add an element at a particular index in the queue. The queue interface inherits all the methods present in the collections interface while implementing the following methods:
#Queue in java how to
Let’s see how to create a queue object using this class. It is known that a queue follows the First-In-First-Out algorithm, but sometimes the elements of the queue are needed to be processed according to the priority, that’s when the PriorityQueue comes into play. PriorityQueue: PriorityQueue class which is implemented in the collection framework provides us a way to process the objects based on the priority. The Deques support element insertion and removal at both ends.Ĭlasses that implement the Queue Interface:ġ.