How to get length of an ArrayList in Java

In this tutorial, we are going to learn about how to get the length/size of a given ArrayList in Java.

Consider, we have the following ArrayList:

ArrayList<String> users = new ArrayList<>(Arrays.asList("john", "kevin", "rose"));

Now, we need to find out the length of an above users arraylist.

Using size() method

To get the length of an ArrayList, we can use the built-in size() method of java.util.ArrayList class.

The size() method returns the total number of elements in a arraylist in integer format.

Here is an example, that gets the length of a users list:

import java.util.ArrayList;
import java.util.Arrays;

public class Main
{
    public static void main(String[] args) {

        ArrayList<String> users = new ArrayList<>(Arrays.asList("john", "kevin", "rose"));
        int length = users.size();
        System.out.println(length);
   }
}

Output:

3