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Showing content from https://www.geeksforgeeks.org/java/copyonwritearrayset-iterator-method-in-java/ below:

CopyOnWriteArraySet iterator() method in Java

Last Updated : 11 Jul, 2025

The

iterator()

method of

CopyOnWriteArraySet

returns an iterator over the elements in this Set in proper sequence. The iterator does NOT support the remove method.

Syntax:

public Iterator iterator()

Return Value:

The function returns

an iterator

over the elements in the Set. Below programs illustrate the above function:

Program 1: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// iterator() method in Java

import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;

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

        // create object of CopyOnWriteArraySet
        CopyOnWriteArraySet<Integer> ArrSet
            = new CopyOnWriteArraySet<Integer>();

        // Add elements
        ArrSet.add(32);
        ArrSet.add(67);
        ArrSet.add(67);
        ArrSet.add(100);

        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);

        // Call iterator() method of
        Iterator iteratorVals = ArrSet.iterator();

        // Print elements of iterator
        // created from CopyOnWriteArraySet
        System.out.println("\nThe iterator values of "
                           + "CopyOnWriteArraySet are:\n");

        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

Output:

CopyOnWriteArraySet: [32, 67, 100]

The iterator values of CopyOnWriteArraySet are:

32
67
100

Program 2: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// iterator() method in Java

import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;

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

        // create object of CopyOnWriteArraySet
        CopyOnWriteArraySet<String> ArrSet
            = new CopyOnWriteArraySet<String>();

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

        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);

        // Call iterator() method of
        Iterator iteratorVals = ArrSet.iterator();

        // Print elements of iterator
        // created from CopyOnWriteArraySet
        System.out.println("\nThe iterator values of "
                           + "CopyOnWriteArraySet are:\n");

        // prints the elements using an iterator
        while (iteratorVals.hasNext()) {
            System.out.println(iteratorVals.next());
        }
    }
}

Output:

CopyOnWriteArraySet: [gopal, gfg, jgec, sudo]

The iterator values of CopyOnWriteArraySet are:

gopal
gfg
jgec
sudo

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

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