Java Programming Language: Queue Tutorial

Hi everyone, welcome back. In this tutorial, I will show how to use the built in functions regarding the queue in Java. A queue is a linear type of data structure that is capable of storing objects. The Queue is a first-in-first-out or FIFO data structure which means that the first item added to the queue is the first item that can be removed. Let’s say the numbers 1, 2 , and 3 are added into a queue in that order. If the items start to get removed, the first item to leave would be 1, then 2, then finally 3.

Queue

The Queue is already an interface that is provided by Java, but we will have to use a PriorityQueue, which is a class that implements the Queue in our project. We can import it into our project:

import java.util.PriorityQueue;

The PriorityQueue class allows us to create an empty queue. Creating a queue is similar to creating other objects in Java.

PriorityQueue q = new PriorityQueue();

Now let’s go over some of the built in functions that Java provides.

isEmpty()

The first function we will go over is the isEmpty() function which checks to see whether or not the queue is empty. The isEmpty() function returns a boolean.

PriorityQueue q = new…