PriorityBlockingQueue size() method in Java Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The size() method of PriorityBlockingQueue is used to find the present size of the queue. It returns the number of elements in the collection. If the collection contains more than Integer.MAX_VALUE elements, then this method returns Integer.MAX_VALUE. Syntax: public int size() Return Value: This method returns the number of elements present in this PriorityBlockingQueue Below are the program to illustrate size() method of PriorityBlockingQueue: Program 1: Java // Java program to demonstrate // size() method import java.util.concurrent.PriorityBlockingQueue; public class GFG { public static void main(String[] args) { // create object of PriorityBlockingQueue PriorityBlockingQueue<String> pbq = new PriorityBlockingQueue<String>(); // Add element to PriorityBlockingQueue pbq.put("1"); pbq.put("2"); pbq.put("3"); pbq.put("4"); // print queue System.out.println("Queue: " + pbq); System.out.println("Queue Size: " + pbq.size()); } } Output: Queue: [1, 2, 3, 4] Queue Size: 4 Program 2: To demonstrate size() for dynamically changing queue. Java // Java program to demonstrate // size() method import java.util.concurrent.PriorityBlockingQueue; public class GFG { public static void main(String[] args) { // create object of PriorityBlockingQueue PriorityBlockingQueue<String> pbq = new PriorityBlockingQueue<String>(); // Add element to PriorityBlockingQueue pbq.put("1"); pbq.put("2"); pbq.put("3"); pbq.put("4"); // print queue System.out.println("Queue: " + pbq); System.out.println("Queue Size: " + pbq.size()); // remove 2 boolean res = pbq.remove("2"); System.out.println("\n2 removed: " + res); // print queue System.out.println("Queue: " + pbq); System.out.println("Queue Size: " + pbq.size()); // add 5 pbq.put("5"); // print queue System.out.println("\n5 added"); System.out.println("Queue: " + pbq); System.out.println("Queue Size: " + pbq.size()); } } Output: Queue: [1, 2, 3, 4] Queue Size: 4 2 removed: true Queue: [1, 4, 3] Queue Size: 3 5 added Queue: [1, 4, 3, 5] Queue Size: 4 Comment More infoAdvertise with us C code_r Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions Java-PriorityBlockingQueue +1 More Practice Tags : JavaJava-Collections Explore 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 readOOPs & InterfacesClasses and Objects in Java10 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 Tutorial15+ min readSynchronization in Java10 min readFile Handling in Java5 min readJava Method References9 min readJava 8 Stream Tutorial15+ min readJava Networking15+ min readJDBC Tutorial12 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 Solutions7 min readJava Quiz | Level Up Your Java Skills1 min readTop 50 Java Project Ideas For Beginners and Advanced [Update 2025]15+ min read Like