Remove elements from ArrayList and CopyOnWriteArrayList

ArrayList provides the remove() methods, like remove (int index) and remove (Object element), you cannot use them to remove items while iterating over ArrayList in Java because they will throw ConcurrentModificationException if called during iteration.

The CopyOnArrayList has remove() method used to remove the element in the list.

1). public E remove(int index)

The remove(int index) method of CopyOnArrayList in Java is used to remove the element at the specified position in the list.

This method throws ArrayIndexOutOfBounds exception if the specified index is out of range i.e index is less than 0 or greater than or equal to the size of the list.

2). public boolean remove(Object o)

The remove(Object o) method of CopyOnArrayList in Java is used to remove the element if it is present in the list.


import java.util.*; 
  
public class CopyOnWriteArrayList1 { 
    public static void main(String[] args) 
    { 
        CopyOnWriteArrayList<String> fruitsList 
            = new CopyOnWriteArrayList<String>(); 
  
        fruitsList.add("apple"); 
        fruitsList.add("mango"); 
        fruitsList.add("kiwi"); 
  
        // print fruitsList 
        System.out.println("CopyOnWriteArrayList of fruitsList is : "
                           + fruitsList); 
  
        fruitsList.remove(0); 
     
        System.out.println(fruitsList); 
    } 
}

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In this article, we have seen How to Remove elements from ArrayList and CopyOnWriteArrayList.