Last Updated : 11 Jul, 2025
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);
}
}
Syntax of ArrayList size() Method
public 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);
}
}
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);
}
}
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