The forEach() method of CopyOnWriteArrayList performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.
Syntax:
public void forEach (Consumer<E> action)
Parameters: This method takes a parameter action which represents the action to be performed for each element.
Returns: This method does not returns anything.
Exceptions: This method throws NullPointerException if the specified action is null.
Below program illustrates the forEach() function of CopyOnWriteArrayList class :
Program 1:
// Java Program to illustrate the CopyOnWriteArrayList// forEach() method in Java  import java.util.concurrent.CopyOnWriteArrayList;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Create object of CopyOnWriteArrayList        CopyOnWriteArrayList<Integer> ArrLis            = new CopyOnWriteArrayList<Integer>();          // Add elements        ArrLis.add(2);        ArrLis.add(3);        ArrLis.add(4);        ArrLis.add(7);          // Print CopyOnWriteArrayList        System.out.println("CopyOnWriteArrayList: "                           + ArrLis);          System.out.println("Traversing this List : ");          // Traverse this queue using forEach() method        ArrLis.forEach((n) -> System.out.println(n));    }} |
Output:
CopyOnWriteArrayList: [2, 3, 4, 7] Traversing this List : 2 3 4 7
Program 2:
// Java Program to illustrate the CopyOnWriteArrayList// forEach() method in Java  import java.util.concurrent.CopyOnWriteArrayList;import java.util.*;  public class GFG {    public static void main(String[] args)    {          // Create object of CopyOnWriteArrayList        CopyOnWriteArrayList<String> ArrLis            = new CopyOnWriteArrayList<String>();          // Add elements        ArrLis.add("Geeks");        ArrLis.add("Gfg");        ArrLis.add("Portal");        ArrLis.add("neveropen");          // Print CopyOnWriteArrayList        System.out.println("CopyOnWriteArrayList: "                           + ArrLis);          System.out.println("Traversing this List : ");          // Traverse this queue using forEach() method        ArrLis.forEach((n) -> System.out.println(n));    }} |
Output:
CopyOnWriteArrayList: [Geeks, Gfg, Portal, neveropen] Traversing this List : Geeks Gfg Portal neveropen
