Set isEmpty() method in Java with Examples Last Updated : 31 Dec, 2018 Suggest changes Share 1 Likes Like Report The java.util.Set.isEmpty() method is used to check if a Set is empty or not. It returns True if the Set is empty otherwise it returns False. Syntax: boolean isEmpty() Parameters: This method does not take any parameter Return Value: The method returns True if the set is empty else returns False. Below program illustrate the java.util.Set.isEmpty() method: Java // Java code to illustrate isEmpty() import java.io.*; import java.util.*; public class SetDemo { public static void main(String args[]) { // Creating an empty Set Set<String> set = new HashSet<String>(); // Use add() method to add elements into the Set set.add("Welcome"); set.add("To"); set.add("Geeks"); set.add("4"); set.add("Geeks"); // Displaying the Set System.out.println("Set: " + set); // Check for the empty set System.out.println("Is the set empty? " + set.isEmpty()); // Clearing the set using clear() method set.clear(); // Again Checking for the empty set System.out.println("Is the set empty? " + set.isEmpty()); } } Output: Set: [4, Geeks, Welcome, To] Is the set empty? false Is the set empty? true Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#isEmpty() Create Quiz G gopaldave Follow 1 Article Tags : Java Java-Collections Java-Functions java-set Explore Java BasicsIntroduction to Java3 min readJava Programming Basics9 min readJava Methods6 min readAccess Modifiers in Java4 min readArrays in Java7 min readJava Strings7 min readRegular Expressions in Java3 min readOOP & InterfacesClasses and Objects in Java5 min readAccess Modifiers in Java4 min readJava Constructors4 min readJava OOP(Object Oriented Programming) Concepts10 min readJava Packages2 min readJava Interface7 min readCollectionsCollections in Java12 min readCollections Class in Java13 min readCollection Interface in Java4 min readIterator in Java4 min readJava Comparator Interface5 min readException HandlingJava Exception Handling6 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 Java7 min readFile Handling in Java4 min readJava Method References7 min readJava 8 Stream Tutorial7 min readJava Networking6 min readJDBC Tutorial5 min readJava Memory Management3 min readGarbage Collection in Java6 min readMemory Leaks in Java3 min readPractice JavaJava Interview Questions and Answers1 min readJava Programs - Java Programming Examples7 min readJava Exercises - Basic to Advanced Java Practice Programs with Solutions5 min readJava Quiz1 min readJava Project Ideas For Beginners and Advanced15+ min read My Profile ${profileImgHtml} My Profile Edit Profile My Courses Join Community Transactions Logout Like