PriorityBlockingQueue peek() method in Java Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The peek() method of PriorityBlockingQueue returns the element at head of the PriorityBlockingQueue. It retrieves the value of the head of LinkedBlockingQueue but does not remove it. If the PriorityBlockingQueue does not contains any element, then this method returns null. A PriorityBlockingQueue queue uses the same ordering rules as class PriorityQueue. Syntax: public E peek() Parameter: This method does not take any parameter. Returns: This method returns the head of the PriorityBlockingQueue. Below program illustrate peek() method of PriorityBlockingQueue. Example 1: Java // Java Program Demonstrate peek() // method of PriorityBlockingQueue import java.util.concurrent.PriorityBlockingQueue; public class GFG { public static void main(String[] args) { // define capacity of PriorityBlockingQueue int capacityOfQueue = 5; // create object of PriorityBlockingQueue PriorityBlockingQueue<Integer> PrioQueue = new PriorityBlockingQueue<Integer>(capacityOfQueue); // Add elements to PriorityBlockingQueue PrioQueue.add(464161); PrioQueue.add(416165); // print PrioQueue System.out.println("PrioQueue: " + PrioQueue); // get head of PriorityBlockingQueue int head = PrioQueue.peek(); // print head of PriorityBlockingQueue System.out.println("Head of Queue: " + head); } } Output: PrioQueue: [416165, 464161] Head of Queue: 416165 Example 2: To illustrate peek() method of PriorityBlockingQueue which contains list of names. Java // Java Program Demonstrate peek() // method of PriorityBlockingQueue import java.util.concurrent.PriorityBlockingQueue; public class GFG { public static void main(String[] args) { // define capacity of PriorityBlockingQueue int capacityOfQueue = 5; // create object of PriorityBlockingQueue PriorityBlockingQueue<String> names = new PriorityBlockingQueue<String>(capacityOfQueue); // Add names of students of girls college names.add("Geeks"); names.add("forGeeks"); names.add("A"); names.add("Computer"); names.add("Portal"); // print PrioQueue System.out.println("List of Names: " + names.toString()); // get head of PriorityBlockingQueue String head = names.peek(); // print head of PriorityBlockingQueue System.out.println("Head of Queue: " + head); // remove one name from head names.poll(); System.out.println("First Name from head is removed"); // print PrioQueue System.out.println("List of Names: " + names.toString()); // get head of PriorityBlockingQueue head = names.peek(); // print head of PriorityBlockingQueue System.out.println("Head of Queue: " + head); } } Output: List of Names: [A, Computer, Geeks, forGeeks, Portal] Head of Queue: A First Name from head is removed List of Names: [Computer, Portal, Geeks, forGeeks] Head of Queue: Computer Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#peek-- Comment More infoAdvertise with us A AmanSingh2210 Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-PriorityBlockingQueue +2 More Practice Tags : JavaJava-CollectionsMisc 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