.size()

The .size() method of the ArrayList class returns the number of elements in the list.

Syntax

Here, a variable size of type int is initialized with the size of a list. The List interface is an ordered collection of elements and is implemented by various classes such as ArrayList, LinkedList, and Vector:

int size = list.size()

Example

The following example creates an ArrayList, uses .add() to append elements to it, and uses .size() to print out its size:

import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    // Create an ArrayList of Strings
    ArrayList<String> list = new ArrayList<>();

    // Add some elements to the list
    list.add("Apple");
    list.add("Banana");
    list.add("Orange");

    // Get the size of the list
    int size = list.size();

    // Print the size of the list
    System.out.println("Size of list: " + size);
  }
}

The output for the above code is:

Size of list: 3