What is the CopyOnWriteArraySet.remove(Object) method in Java?

Definition

The remove() method of the CopyOnWriteArraySet class in Java removes the element that matches the element passed as a parameter.

The CopyOnWriteArraySet class

The CopyOnWriteArraySet is a thread-safe version of SetA collection that contains no duplicate elements. It internally uses CopyOnWriteArrayList for its operations. For all the write operations like add, set, etc., the class makes a fresh copy of the underlying array and operates on the cloned array.

Syntax

public boolean remove(Object obj)

Parameters

This method takes the element to be removed from the set as a parameter.

Return value

The remove method returns true if the passed argument is present in the set. Otherwise, it returns false.

Code

The code below demonstrates the use of the remove method:

import java.util.concurrent.CopyOnWriteArrayList;
class Remove {
    public static void main( String args[] ) {
        // Creating CopyOnWriteArrayList which can contain string elements 
        CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
        // add elememts 
        list.add("hi");
        list.add("hello");
        System.out.println("The list is: " + list);
        // remove element -  hi
        System.out.println("\nCalling list.remove('hi'). Is Removed :" + list.remove("hi"));
        System.out.println("After removing element 'hi'. The list is: " + list);
        // remove element -  bye
        System.out.println("\nCalling list.remove('bye'). Is Removed :" + list.remove("bye"));
        System.out.println("The list is: " + list);
    }
}