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

CopyOnWriteArraySet remove() method in Java

Last Updated : 11 Jul, 2025

The

remove()

method of

CopyOnWriteArraySet

removes the specified element if it is present in the set.

Syntax:

public boolean remove(Object o)

Parameters:

The function accepts a mandatory parameter

which specifies the element to be removed from the set if present.

Return Value:

The function returns

true

if set contains the specified element. Below programs illustrate the above function:

Program 1: Java


 // Java Program to illustrate the
// remove() 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(98);
        ArrSet.add(100);

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

        // Remove using remove() function
        if (ArrSet.remove(100))
            System.out.println("Set after removal"
                               + " of 100 is: "
                               + ArrSet);
        else
            System.out.println("100 is not present");
    }
}

Output:

CopyOnWriteArraySet: [32, 67, 98, 100]
Set after removal of 100 is: [32, 67, 98]

Program 2: Java


 // Java Program to illustrate the
// isEmpty() 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("geeks");
        ArrSet.add("geeks");
        ArrSet.add("technical");

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

        // Remove using remove() function
        if (ArrSet.remove("scripter"))
            System.out.println("Set after removal"
                               + " of 'scripter' is: "
                               + ArrSet);
        else
            System.out.println("'scripter' is not present");
    }
}

Output:

CopyOnWriteArraySet: [gopal, geeks, technical]
'scripter' is not present

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

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