ArrayList size() Method in Java with Examples Last Updated : 10 Dec, 2024 Comments Improve Suggest changes Like Article Like Report In Java, the size() method is used to get the number of elements in an ArrayList.Example 1: Here, we will use the size() method to get the number of elements in an ArrayList of integers. Java // Java program to demonstrate the use of // size() method for Integer ArrayList import java.util.ArrayList; public class GFG { public static void main(String[] args) { // Creating an ArrayList of Integers ArrayList<Integer> n = new ArrayList<>(); // Adding elements to the ArrayList n.add(21); n.add(22); n.add(23); // Getting and printing the // size of the ArrayList int s = n.size(); System.out.println("" + s); } } Output3 Syntax of ArrayList size() Methodpublic int size()Returns Value: This method returns the number of elements in the list. Example 2: Here, we use the size() method to get the number of elements in an ArrayList of strings. Java // Java program to demonstrate the use of // size() method for String ArrayList import java.util.ArrayList; public class GFG { public static void main(String[] args) { // Creating an ArrayList of Strings ArrayList<String> f = new ArrayList<>(); // Adding elements to the ArrayList f.add("Apple"); f.add("Banana"); f.add("Orange"); // Getting and printing the // size of the ArrayList int s = f.size(); System.out.println("" + s); } } Output3 Example 3: Here, we demonstrate how to use the size() method on an ArrayList that stores objects. Java // Java program to demonstrate the use of // size() method for Object ArrayList import java.util.ArrayList; class Person { String n; int a; Person(String n, int a) { this.n = n; this.a = a; } } public class Main { public static void main(String[] args) { // Creating an ArrayList of Person objects ArrayList<Person> p = new ArrayList<>(); // Adding elements (objects) to the ArrayList p.add(new Person("Ram", 22)); p.add(new Person("Shyam", 25)); // Getting and printing the // size of the ArrayList int s = p.size(); System.out.println("" + s); } } Output2 Comment More infoAdvertise with us Next Article ArrayList size() Method in Java with Examples rohitprasad3 Follow Improve Article Tags : Java Java-Collections Java - util package Java-Functions Java-ArrayList +1 More Practice Tags : JavaJava-Collections Similar Reads ArrayList in Java Java ArrayList is a part of the collections framework and it is a class of java.util package. It provides us with dynamic-sized arrays in Java. 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