![]() If a user wants to implement the functionality of the Queue interface in Java, then it is mandatory to have some solid classes that implement the Queue interface. Public interface Queue extends CollectionĪs we have discussed above that the Queue is an interface, therefore we can also say that the queue cannot be instantiated because interfaces cannot be instantiated. The generic representation of the Java Queue interface is shown below: It also extends the Collection interface. The Queue is an interface in the Java that belongs to Java.util package. Components are added inside the queue from the rear end of the queue and the components are extracted from the front end of the queue. The following figure perfectly describes the FIFO (First In, First Out) property of the Java queue.Īs explained in the preceding image, we can see that the queue is a linear data structure with two terminals, i.e., start (front) and end (rear). Queue has two ends that is front and rear. There are two ends in the queue collection, i.e., front & rear. The components in a queue are stored in a FIFO (First In, First Out) behavior. In simple words, we can say that the queue is a type of data structure in the Java programming language that stores elements of the same kind. If(size = data.A queue is another kind of linear data structure that is used to store elements just like any other data structure but in a particular manner. Now that we know completely about all the things we needed to know before starting the process, let's now dive into it: the total number of elements present in the queue at a given time. The Size Variable: that will tell us the current size of the queue i.e.The Front Variable: that will always remain at the first element of the queue to ease the methods that we are going to apply.The Data Array: that will contain all the data of the queue.There are three data members inside this class:. ![]() For now, we will focus on making a queue of a fixed size. So, adding the feature of dynamic capacity will be done in the next question. So, why are we limiting its capacity? Let's just say, we have a lot to implement and learn in this question. Now, why is that so? We know that a queue is a dynamic data structure. This means that we are making a queue of a fixed capacity.But the CustomQueue class has a parameter called "cap", which stands for capacity. We are given a CustomQueue class with three data members.Now, let us see what all is given to us in the question and what all we need to implement, and how we will implement it. Both insertion and deletion of an element from the queue take O(1) time.The elements are always removed from the front of the queue.The elements are entered in the queue from the rear end or in other words the elements are always inserted at the back of the queue.It is almost the opposite of the stack data structure which is based on the LIFO principle i.e. The element that is entered first into the queue is the element that will get removed from the queue first whenever we try to remove elements from it. The queue data structure is a dynamic data structure which is based on the FIFO principle i.e.Stack To Queue Adapter - Remove Efficient
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