CopyOnWriteArraySet add() method in Java

The add(E e) method of CopyOnWriteArraySet inserts the element passed in the parameter to the end of the Set or at a specified index in the Set. The function returns true on addition of new element to the Set.

Syntax:

public boolean add(E e)

Parameters: The function accepts a single mandatory parameter element which specifies the element to be added in the Set.



Return Value: The function returns true on addition in the Set.

Below programs illustrate the above function:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program to illustrate the CopyOnWriteArraySet
// add(element) 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);
  
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
  
        // 4 is already present hence cannot add
        System.out.println("On adding 4 it returns "
                           + ArrSet.add(4));
  
        // print CopyOnWriteArraySet
        System.out.println("Updated CopyOnWriteArraySet: "
                           + ArrSet);
    }
}

chevron_right


Output:

CopyOnWriteArraySet: [2, 3, 4, 7]
On adding 4 it returns false
Updated CopyOnWriteArraySet: [2, 3, 4, 7]

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program to illustrate the CopyOnWriteArraySet
// add(element) 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(3);
        ArrSet.add(3);
  
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
  
        // 45 is not present hence add
        System.out.println("On adding 45 it returns "
                           + ArrSet.add(45));
  
        // print CopyOnWriteArraySet
        System.out.println("Updated CopyOnWriteArraySet: "
                           + ArrSet);
    }
}

chevron_right


Output:

CopyOnWriteArraySet: [2, 3]
On adding 45 it returns true
Updated CopyOnWriteArraySet: [2, 3, 45]

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



My Personal Notes arrow_drop_up

The function of education is to teach one to think intensively and to think critically

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.