CopyOnWriteArrayList size() method in Java Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report The size() method of CopyOnWriteArrayList returns the size of the list. It returns the number of elements in the list. Syntax: public int size() Parameters: The function does not accepts any parameter. Return Value: The function returns the size of the list. Below programs illustrate the above function: Program 1: Java // Java Program to illustrate the CopyOnWriteArrayList // size() method in Java import java.util.concurrent.CopyOnWriteArrayList; import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArrayList CopyOnWriteArrayList<Integer> ArrLis = new CopyOnWriteArrayList<Integer>(); // Add elements ArrLis.add(32); ArrLis.add(67); ArrLis.add(98); ArrLis.add(100); // print CopyOnWriteArrayList System.out.println("CopyOnWriteArrayList: " + ArrLis); // size value print System.out.println("size of ArrLis: " + ArrLis.size()); } } Output: CopyOnWriteArrayList: [32, 67, 98, 100] size of ArrLis: 4 Program 2: Java // Java Program to illustrate the CopyOnWriteArrayList // size() method in Java import java.util.concurrent.CopyOnWriteArrayList; import java.util.*; public class GFG { public static void main(String[] args) { // create object of CopyOnWriteArrayList CopyOnWriteArrayList<String> ArrLis = new CopyOnWriteArrayList<String>(); // Add elements ArrLis.add("gopal"); ArrLis.add("gfg"); ArrLis.add("jgec"); ArrLis.add("sudo"); // print CopyOnWriteArrayList System.out.println("CopyOnWriteArrayList: " + ArrLis); // size value print System.out.println("size of ArrLis: " + ArrLis.size()); } } Output: CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] size of ArrLis: 4 Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#size-- Create Quiz Comment G gopaldave Follow 0 Improve G gopaldave Follow 0 Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-CopyOnWriteArrayList +2 More 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 References9 min readJava 8 Stream Tutorial7 min readJava Networking6 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 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 Like