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

CopyOnWriteArraySet forEach() method in Java with Examples

Last Updated : 11 Jul, 2025

The

forEach()

method of

CopyOnWriteArraySet

is an in-built function in Java which is used to traverse each element in this Set.

Syntax:

public void forEach (Consumer<E> action)

Parameters:

This method takes a parameter action which represents the action to be performed for each element.

Return Value:

This method does not returns anything.

Exceptions:

This method throws

NullPointerException

if the specified action is null. Below program illustrates the forEach() function of CopyOnWriteArraySet class:

Example 1: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// forEach() 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(2);
        ArrSet.add(3);
        ArrSet.add(4);
        ArrSet.add(7);
        ArrSet.add(8);

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

        // Traverse this set using forEach() method
        ArrSet.forEach((n) -> System.out.println(n));
    }
}

Output:

CopyOnWriteArraySet: [2, 3, 4, 7, 8]
Traversing this Set: 
2
3
4
7
8

Example 2: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// forEach() 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("GeeksforGeeks");
        ArrSet.add("Geeks");
        ArrSet.add("Computer Science");
        ArrSet.add("Portal");
        ArrSet.add("Gfg");

        // Print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
        System.out.println("Traversing this Set: ");

        // Traverse this set using forEach() method
        ArrSet.forEach((n) -> System.out.println(n));
    }
}

Output:

CopyOnWriteArraySet: [GeeksforGeeks, Geeks, Computer Science, Portal, Gfg]
Traversing this Set: 
GeeksforGeeks
Geeks
Computer Science
Portal
Gfg

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#forEach-java.util.function.Consumer-

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