How to Check if a PriorityQueue is Empty or Contains Elements in Java? Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report In this article, we will demonstrate how to check if a Priority Queue is empty or not. The java.util.PriorityQueue.isEmpty() method is used to check if the Priority Queue is empty or not. Based on the Boolean value it returns the Response for the same. Syntax: Priority_Queue.isEmpty()Parameters: There is no need to pass any parameter inside the function. Return Value: The method returns a boolean value, ie. True if Priority Queue is empty else false. Program to Check if a PriorityQueue is EmptyThe below programs illustrate the Java.util.PriorityQueue.isEmpty() method: Example 1:The program showing that the PriorityQueue is not Empty: Java // Java code to illustrate isEmpty() method // When Priority Queue contains some elements import java.util.PriorityQueue; // Driver Class public class Main { // Main Function public static void main(String[] args) { // Creating a PriorityQueue PriorityQueue PQ = new PriorityQueue<Integer>(); // Inserting some elements PQ.add(6); PQ.add(4); PQ.add(55); PQ.add(1); // Checking whether PQ is empty or not // by calling isEmpty() method on PQ System.out.println(PQ.isEmpty()); } } Outputfalse Example 2:The program showing that the PriorityQueue is Empty: Java // Java code to illustrate isEmpty() method // When Priority Queue doesn't contains element import java.util.PriorityQueue; // Driver Class public class Main { // Main Function public static void main(String[] args) { // Creating an empty PriorityQueue PriorityQueue PQ = new PriorityQueue<Integer>(); // Checking whether PQ is empty or not // by calling isEmpty() method on PQ System.out.println(PQ.isEmpty()); } } Outputtrue Comment More info P pradeep6036ymca Follow Improve Article Tags : Java Java Programs priority-queue java-priority-queue Java Examples +1 More Explore Java BasicsIntroduction to Java4 min readJava Programming Basics9 min readJava Methods7 min readAccess Modifiers in Java6 min readArrays in Java9 min readJava Strings8 min readRegular Expressions in Java7 min readOOP & InterfacesClasses and Objects in Java10 min readAccess Modifiers in Java6 min readJava Constructors10 min readJava OOP(Object Oriented Programming) Concepts10 min readJava Packages7 min readJava Interface11 min readCollectionsCollections in Java12 min readCollections Class in Java13 min readCollection Interface in Java6 min readIterator in Java5 min readJava Comparator Interface6 min readException HandlingJava Exception Handling8 min readJava Try Catch Block4 min readJava final, finally and finalize4 min readChained Exceptions in Java3 min readNull Pointer Exception in Java5 min readException Handling with Method Overriding in Java4 min readJava AdvancedJava Multithreading Tutorial3 min readSynchronization in Java10 min readFile Handling in Java4 min readJava Method References9 min readJava 8 Stream Tutorial7 min readJava Networking15+ min readJDBC Tutorial5 min readJava Memory Management4 min readGarbage Collection in Java6 min readMemory Leaks in Java3 min readPractice JavaJava Interview Questions and Answers15+ min readJava Programs - Java Programming Examples8 min readJava Exercises - Basic to Advanced Java Practice Programs with Solutions5 min readJava Quiz | Level Up Your Java Skills1 min readTop 50 Java Project Ideas For Beginners and Advanced [Update 2025]15+ min read Like