How to Convert a PriorityQueue into an Array, List, and Set in Java? Last Updated : 16 Feb, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report In Java, PriorityQueue is an implementation of the Queue interface. It means high-priority elements can be saved first compared to lower-priority elements in the queue, and it follows the natural order of elements. In this article, we will learn how to convert a PriorityQueue into an Array, List, and Set in Java. Approach to convert a PriorityQueue into an Array:First, create the class named GfGPriorityQueueToArray and define the main method.In the main method, create one integer priority queue using the PriorityQueue.Adding the elements of the two-priority queue.Using toArray() method to convert the priority queue to an array.Print the results array using a for loop traversal array and print the elements.Program to Convert a PriorityQueue into an Array in Java Java // Java Program to Convert a PriorityQueue into an Array import java.util.PriorityQueue; public class GfGPriorityQueueToArray { // Main method public static void main(String[] args) { // Create a PriorityQueue PriorityQueue<Integer> priorityQueue = new PriorityQueue<>(); priorityQueue.add(3); priorityQueue.add(1); priorityQueue.add(4); priorityQueue.add(2); // Convert PriorityQueue to an array Integer[] array = priorityQueue.toArray(new Integer[0]); // Print the elements in the array System.out.println("Array Elements are:"); for (Integer element : array) { System.out.println(element); } } } OutputArray Elements are: 1 2 4 3 Explanation of the Program:The above Java program is the example of the converting the PriorityQueue into the array using toArray() method. Once it converted into an array, traverse the elements, and then print the elements. toArray(): This is a common method that can be used to convert another form object into the array object, and it's returned the array objects.Approach to convert a PriorityQueue into a List:First, create the class named GfGPriorityQueueToList and define the main method.In main method, create one integer priority queue using the PriorityQueue.Adding the elements of the two priority queues.Create the one list using List. After that add the priority queue into the list.Print the results list.Program to Convert a PriorityQueue into a List in Java Java // Java program to convert a PriorityQueue into a List import java.util.ArrayList; import java.util.List; import java.util.PriorityQueue; public class GfGPriorityQueueToList { public static void main(String[] args) { // Create a PriorityQueue PriorityQueue<Integer> priorityQueue = new PriorityQueue<>(); priorityQueue.add(3); priorityQueue.add(1); priorityQueue.add(4); priorityQueue.add(2); // Convert PriorityQueue to a List List<Integer> list = new ArrayList<>(priorityQueue); // Print the elements in the list System.out.println("List Elements are: "+list); } } OutputList Elements are: [1, 2, 4, 3] Explanation of the Program:The above Java program is the example of the converting the PriorityQueue into the list using list interface.Once it converted into the list then print the resultant list.Approach to convert a PriorityQueue into a Set:First, create the class named GfGPriorityQueueToSet and define the main method.In main method, create one integer priority queue using the PriorityQueue.Adding the elements of the two priority queues.Create the one set using Set interface.After that add the priority queue into the set.Then, print the resultant set.Program to Convert a PriorityQueue into a Set in Java Java // Java program to convert a PriorityQueue into a Set import java.util.HashSet; import java.util.PriorityQueue; import java.util.Set; public class PriorityQueueToSet { public static void main(String[] args) { // Create a PriorityQueue PriorityQueue<Integer> priorityQueue = new PriorityQueue<>(); priorityQueue.add(3); priorityQueue.add(1); priorityQueue.add(4); priorityQueue.add(2); // Convert PriorityQueue to a Set Set<Integer> set = new HashSet<>(priorityQueue); // Print the elements in the Set System.out.println("Set elements are: "+set); } } OutputSet elements are: [1, 2, 3, 4] Explanation of the Program:The above Java program is the example of the converting the PriorityQueue into the set using Set Interface.Once it converted into the Set then print the resultant set. Comment More infoAdvertise with us Next Article How to Convert a PriorityQueue into an Array, List, and Set in Java? S seepanarajvskq Follow Improve Article Tags : Java Java Programs Java-Arrays java-priority-queue java-set java-list Java Examples +3 More Practice Tags : Java Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. It is known for its Write Once, Run Anywhere capability, which means code written in Java can run on any device that supports the Java Virtual Machine (JVM).Java s 10 min read Java OOP(Object Oriented Programming) Concepts Java Object-Oriented Programming (OOPs) is a fundamental concept in Java that every developer must understand. It allows developers to structure code using classes and objects, making it more modular, reusable, and scalable.The core idea of OOPs is to bind data and the functions that operate on it, 13 min read Java Interview Questions and Answers Java is one of the most popular programming languages in the world, known for its versatility, portability, and wide range of applications. Java is the most used language in top companies such as Uber, Airbnb, Google, Netflix, Instagram, Spotify, Amazon, and many more because of its features and per 15+ min read Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. Non-Linear Components are those that are changed with respect to the voltage and current. Elements that do not follow ohm's law are called Non-linear Components. Non-linear Co 11 min read Arrays in Java Arrays in Java are one of the most fundamental data structures that allow us to store multiple values of the same type in a single variable. They are useful for storing and managing collections of data. Arrays in Java are objects, which makes them work differently from arrays in C/C++ in terms of me 15+ min read Collections in Java Any group of individual objects that are represented as a single unit is known as a Java Collection of Objects. In Java, a separate framework named the "Collection Framework" has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interfac 15+ min read Inheritance in Java Java Inheritance is a fundamental concept in OOP(Object-Oriented Programming). It is the mechanism in Java by which one class is allowed to inherit the features(fields and methods) of another class. In Java, Inheritance means creating new classes based on existing ones. A class that inherits from an 13 min read Spring Boot Tutorial Spring Boot is a Java framework that makes it easier to create and run Java applications. It simplifies the configuration and setup process, allowing developers to focus more on writing code for their applications. This Spring Boot Tutorial is a comprehensive guide that covers both basic and advance 10 min read Java Exception Handling Exception handling in Java allows developers to manage runtime errors effectively by using mechanisms like try-catch block, finally block, throwing Exceptions, Custom Exception handling, etc. An Exception is an unwanted or unexpected event that occurs during the execution of a program, i.e., at runt 10 min read Java Programs - Java Programming Examples In this article, we will learn and prepare for Interviews using Java Programming Examples. From basic Java programs like the Fibonacci series, Prime numbers, Factorial numbers, and Palindrome numbers to advanced Java programs.Java is one of the most popular programming languages today because of its 8 min read Like