**`CopyOnWriteArrayList`** is a thread-safe version of an ArrayList. For all the write operations, it makes a fresh copy underlying array and performs the operation in the cloned array. Due to this, the performance is lower when compared to `ArrayList`. Read more about `CopyOnWriteArrayList` [here](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html).

The **`add` method** of the `CopyOnWriteArrayList` class adds an element to the end of the `CopyOnWriteArrayList`.


#     
## Syntax

```java
public boolean add(E e);
```

## Parameters

The `add` method takes the element to be added to the list as a parameter.
## Return value
The `add` method returns true if the element is added to the list.


## Code

The code below demonstrates how to use the `add` method.





import java.util.concurrent.CopyOnWriteArrayList;
class Add {
    public static void main( String args[] ) {
      CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
      list.add("hello");
      System.out.println("The list is " + list);
      list.add("hi");
      System.out.println("The list is " + list);
    }
}

## Explanation

In the code above, we:

* Import the `CopyOnWriteArrayList` class.

* Create a `CopyOnWriteArrayList` 
object with the name `list`. 

* Use the `add` method of the `list` object to add an element (`"hello"`) to the list. 

* Then we print the list.

* Use the `add` method of the `list` object to add another element (`"hi"`) to the list. 
* Then we print the list. 

What is the CopyOnWriteArrayList.add method in Java?

Thread-safe CopyOnWriteArrayList's add method inserts elements, returning true if added. It involves copying the array, resulting in lower performance.