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CopyOnWriteArrayList forEach() method in Java with Examples

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  • Last Updated : 26 Mar, 2019
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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("geeksforgeeks");
  
        // 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, geeksforgeeks]
Traversing this List : 
Geeks
Gfg
Portal
geeksforgeeks

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#forEach-java.util.function.Consumer-


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