As you continue your journey, you’ll encounter even more use cases and variations. These are just a couple of the more advanced ways you can use Java Queue. When we print the Deque, we see the elements in the order they were added. In this example, we created a Deque and added an integer to the beginning (10) and end (20) of the Deque. Let’s see it in action: Deque deque = new ArrayDeque() Deque has various implementations, and one of them is ArrayDeque. It’s a type of Queue where you can add or remove elements from both ends. Deque in Javaĭeque (pronounced ‘deck’) stands for ‘Double Ended Queue’. Although we added the integers in the order 15, 10, 20, the PriorityQueue reorders them based on their natural ordering (in this case, ascending numerical order). In this example, we created a PriorityQueue and added three integers. Let’s demonstrate this with an example: Queue priorityQueue = new PriorityQueue() PriorityQueue in JavaĪ PriorityQueue is a special type of Queue that orders its elements based on their natural ordering or a custom Comparator provided during Queue construction. Two common ones are PriorityQueue and Deque. Intermediate Java Queue: PriorityQueue and DequeĪs you become more comfortable with Java Queue, you’ll encounter more complex use cases. In the following sections, we’ll delve into more complex uses and alternative approaches. That’s the basics of creating and manipulating a Queue in Java. When we print the Queue, we see that 5 is no longer there. We removed the head of the Queue, which is the integer 5. Let’s remove an element: int removedElement = myQueue.remove() This method removes and returns the head of the Queue. We remove elements from a Queue using the remove() method. When we print the Queue, we see the elements in the order they were added. Let’s add some integers to our Queue: myQueue.add(5) We add elements to a Queue using the add() method. It allows the compiler to infer the type arguments, which makes the code cleaner and easier to read. The ” is a Java feature called Diamond Operator. In this code, we’ve created a Queue named ‘myQueue’ that can hold integers. Here’s how to create a Queue using LinkedList: Queue myQueue = new LinkedList() Instead, we use classes that implement the Queue interface. In Java, we can’t directly instantiate a Queue because it’s an interface. Let’s start with the basics: creating a Queue and adding and removing elements. ![]() The Queue follows the FIFO (First In, First Out) principle. It’s used to hold multiple elements that are about to be processed. ![]() ![]() Java’s Queue interface is part of the Java Collections Framework.
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