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Showing content from https://www.geeksforgeeks.org/java/copyonwritearraylist-size-method-in-java/ below:

CopyOnWriteArrayList size() method in Java

Last Updated : 11 Jul, 2025

The

size()

method of

CopyOnWriteArrayList

returns the size of the list. It returns the number of elements in the list.

Syntax:

public int size()

Parameters:

The function does not accepts any parameter.

Return Value:

The function returns the size of the list. Below programs illustrate the above function:

Program 1: Java


 // Java Program to illustrate the CopyOnWriteArrayList
// size() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

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

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();

        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: "
                                          + ArrLis);

        // size value print
        System.out.println("size of ArrLis: " 
                              + ArrLis.size());
    }
}

Output:

CopyOnWriteArrayList: [32, 67, 98, 100]
size of ArrLis: 4

Program 2: Java


 // Java Program to illustrate the CopyOnWriteArrayList
// size() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

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

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<String> ArrLis
            = new CopyOnWriteArrayList<String>();

        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                          + ArrLis);

        // size value print
        System.out.println("size of ArrLis: " 
                                + ArrLis.size());
    }
}

Output:

CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
size of ArrLis: 4

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#size--

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