What is the CopyOnWriteArrayList.isEmpty() method in Java?

What is the CopyOnWriteArrayList.isEmpty() method in Java? Answer

CopyOnWriteArrayList is a thread-safe version of an ArrayList. For all the write operations like add()set(), etc., it makes a fresh copy of the underlying array and performs the operations in the cloned array. This results in lower performance when compared to ArrayList.

The isEmpty() method verifies if the CopyOnWriteArrayList object contains no elements.

Syntax

public boolean isEmpty();

Parameters

This method takes no arguments.

Return value

This method returns true if the list contains no elements. Otherwise, it returns false.

The following code demonstrates the use of the isEmpty() method:

import java.util.concurrent.CopyOnWriteArrayList;
class IsEmpty  {
    public static void main( String args[] ) {
        // Creating an empty list
        CopyOnWriteArrayList<Integer> list = new CopyOnWriteArrayList<>();
        
        // Printing the list
        System.out.println("The list is: " + list);
        
        // Checking if the list is empty
        System.out.println("Is list Empty: " + list.isEmpty());

        // Adding elements 
        list.add(1);

        System.out.println("The list is: " + list);
        System.out.println("Is list Empty: " + list.isEmpty());
    }
}

Explanation

In the code above, we create a CopyOnWriteArrayList object named, list. Initially, it contains no elements, so the isEmpty() method returns true. Then, we add one element to the list object. Now, the isEmpty() method returns false because the list object contains one element.

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