How to Get a Size of Collection in Java? Last Updated : 15 Oct, 2020 Suggest changes Share Like Article Like Report Given a Collection in Java, the task is to find the length or size of the collection. Examples: Input: Array_List: [1, 2, 3,4] Output: 4 Input: Linked_List: [geeks, for, geeks] Output: 3 The Size of the different collections can be found with the size() method. This method returns the number of elements in this collection. This method does not take any parameters. Below is the Implementation: Example 1: Java // Java program to demonstrate // size() method of collection import java.util.*; public class Example1 { public static void main(String[] args) { // Creating object of List<Integer> List<Integer> Array_List = new ArrayList<Integer>(); // add elements Array_List.add(1); Array_List.add(2); Array_List.add(3); Array_List.add(3); // getting total size of list // using size() method int size = Array_List.size(); // print the size of list System.out.println("Size of list = " + size); // print list System.out.println("Array_List = " + Array_List); } } OutputSize of list = 4 Array_List = [1, 2, 3, 3] Example 2: Java // Java program to demonstrate // size() method of Collection import java.util.*; import java.io.*; class Example2 { public static void main(String[] args) { // Creating object of LinkedList<Integer> LinkedList<String> al = new LinkedList<String>(); // Populating LinkedList al.add("GEEKS"); al.add("FOR"); al.add("GEEKS"); // getting total size of Linkedlist // using size() method int size = al.size(); // print the size System.out.println("Size of the linkedlist = " + size); // print Linkedlist System.out.println("Linkedlist = " + al); } } OutputSize of the linkedlist = 3 Linkedlist = [GEEKS, FOR, GEEKS] K kumar_satyam Follow Article Tags : Java Java Programs Java-Collections Explore Java BasicsIntroduction to Java3 min readJava Programming Basics9 min readJava Methods6 min readAccess Modifiers in Java4 min readArrays in Java7 min readJava Strings8 min readRegular Expressions in Java3 min readOOP & InterfacesClasses and Objects in Java9 min readAccess Modifiers in Java4 min readJava Constructors10 min readJava OOP(Object Oriented Programming) Concepts10 min readJava Packages7 min readJava Interface7 min readCollectionsCollections in Java12 min readCollections Class in Java13 min readCollection Interface in Java4 min readIterator in Java5 min readJava Comparator Interface6 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 Java10 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 My Profile ${profileImgHtml} My Profile Edit Profile My Courses Join Community Transactions Logout Like