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

CopyOnWriteArraySet removeIf() method in Java with Examples

Last Updated : 11 Jul, 2025

The

removeIf()

method of

CopyonWriteArraySet

method removes the element from this CopyOnWriteArraySet that satisfies the specified condition.

Syntax:

public boolean removeIf (Predicate<E> filter)

Parameters:

This method accepts a mandatory parameter

filter

which is the predicate value based on which elements are removed from this set.

Return Value:

This method returns a

boolean value

such as true, if the CopyOnWriteArraySet is changed. Else this method returns false.

Exceptions:

This method throws

NullPointerException

if the specified Predicate filter is null. Below program illustrates the removeIf() function of CopyOnWriteArrayList class :

Program 1: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// removeIf() 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(10);
        ArrSet.add(20);
        ArrSet.add(30);
        ArrSet.add(40);
        ArrSet.add(50);
        ArrSet.add(60);
        ArrSet.add(70);
        ArrSet.add(80);
        ArrSet.add(90);

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

        // if a number in the set is
        // divisible by 3, then remove it
        ArrSet.removeIf(number -> number % 3 == 0);

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

Output:

CopyOnWriteArraySet: [10, 20, 30, 40, 50, 60, 70, 80, 90]
Updated CopyOnWriteArraySet: [10, 20, 40, 50, 70, 80]

Program 2: Java


 // Java Program to illustrate the CopyOnWriteArraySet
// removeIf() 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("GFG");
        ArrSet.add("Geeks");
        ArrSet.add("Gfg");

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

        try {

            // if a number in the set is
            // divisible by 3, then remove it
            // This will throw NullPointerException
            ArrSet.removeIf(null);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

CopyOnWriteArraySet: [GeeksforGeeks, GFG, Geeks, Gfg]
java.lang.NullPointerException

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