The remove method can be used to remove an element at a specific index of the CopyOnWriteArrayList object.
CopyOnWriteArrayListis a thread-safe version of an ArrayList. For all the write operations likeadd,set, etc., it makes a fresh copy of the underlying array and performs the operations in the cloned array. Due to this, the performance is slower when compared toArrayList.
public E remove(int index)
This method takes the integer value representing the index of the element as an argument.
This method removes and returns the element present at the specific index.
This method throws IndexOutOfBoundsException if the index is negative or greater than the size of the list.
The code below demonstrates how to use the remove method:
import java.util.concurrent.CopyOnWriteArrayList;class RemoveExample {public static void main( String args[] ) {// create CopyOnWriteArraySet object which can store integer objectCopyOnWriteArrayList<Integer> list = new CopyOnWriteArrayList<>();// add elememtslist.add(1);list.add(2);list.add(3);// Print listSystem.out.println("The list is: " + list);// use remove method to retrieve element at index 0System.out.println("\nlist.remove(0) : " + list.remove(0));// use remove method to retrieve element at index 1System.out.println("\nlist.remove(1) : " + list.remove(1));}}
In the code above,
In line 1, we import the CopyOnWriteArrayList class.
In line 5, we create a CopyOnWriteArrayList object with the name list.
In lines 8-10, we use the add method to add three elements to the list. The list will be [1,2,3].
In line 16, we use the remove method with 0 as an argument. This will delete the element at index 0 and return the removed value. In our case,1 is returned. Now the list will be [2,3].
In line 19, we use the remove method with 1 as an argument. This will delete the element at index 1 and return the removed value. In our case,3 is returned.