CopyOnWriteArraySet iterator() method in Java

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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