There are mainly five operations of the Queue interface. Hence we create the instance of the LinkedList and the PriorityQueue class and assign it to the queue interface. Since the Queue is an interface, we cannot create an instance of it. If you are not aware of what is Queue Interface then you must check it out here. LinkedList and PriorityQueue are the two classes that implement the Queue interface. Queue interface is a part of Java Collections that consists of two implementations: Queue Implementation using Queue Interface in Java Queue is empty Also Read: Queue Interface in Java 2. peek function to return front element of the queue enqueue function for adding an item to the rear dequeue function for removing the front element So here we will implement a queue data structure using an array in Java. The complexity of enqueue and dequeue operations in a queue using an array is O(1).Īlthough the use of all kinds of abstract data types such as Stack, Queue, and LinkedList is provided in Java it is always desirable to understand the basics of the data structure and implement it accordingly. Peek: It is used to return the front value without removing it.
#Java queue remove full
IsFull: It is used to check whether the queue is full or not. IsEmpty: It is used to check whether the queue is empty or not. Basic Functions of QueueĮnqueue: It is used to add an element at the rear of the queue.ĭequeue: It is used to remove an element from the front of the queue.
The value of both the Rear and Front is set to -1 initially and then these values are incremented or decremented as the elements are inserted and deleted. Hence we can say that the Queue's working principle is based on First-In-First-Out(FIFO).Ī Queue is a linear data structure in which elements are inserted from one end called the Rear and are removed from the other end called the Front. Whoever is first, is going to get the ticket first. In the next tutorials, we will learn about different subinterfaces of the Queue interface and its implementation in detail.The concept of a Queue data structure is similar to the queue we come across in our day-to-day life like at a bus stop.Īnd you have to wait until your number arrives, right? Creating Queue using the PriorityQueue class Implementing the PriorityQueue Class import Creating Queue using the LinkedList class Implementing the LinkedList Class import
In Java, we must import package in order to use Queue.
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