In CopyOnWriteArrayList, operations such as add, remove, etc., are implemented on a copy of the of the array. It definitely impacts performance but the trade-off is that the data remains intact.

import java.util.Iterator;import java.util.concurrent.CopyOnWriteArrayList;public class UsingCopyOnWriteArrayList{    public static void main(String args[])   {        CopyOnWriteArrayList copyOnWriteArrayList = new CopyOnWriteArrayList();        copyOnWriteArrayList.add("United Status");        copyOnWriteArrayList.add("France");        copyOnWriteArrayList.add("China");      copyOnWriteArrayList.add("Russia");      copyOnWriteArrayList.add("United Kingdom");              Iterator iteratorForCopyOnWriteArrayList = copyOnWriteArrayList.iterator();      System.out.println("Iterating CopyOnWriteArrayList");        while(iteratorForCopyOnWriteArrayList.hasNext()){         System.out.println("Element : " + iteratorForCopyOnWriteArrayList.next());        }    }}/*

Expected output:

[[email protected]]# java UsingCopyOnWriteArrayListIterating CopyOnWriteArrayListElement : United StatusElement : FranceElement : ChinaElement : RussiaElement : United Kingdom*/