Java ArrayList forEach() Method

December 13, 2022

What is an ArrayList?

Arraylist is a part of collection framework in java. It contains some inbuilt function like forEach() function which can be found in the java.util.ArrayList Package.
It implements the List interface of the collections framework.

Here, in the page we will discuss about the java ArrayList’s forEach() Method .

Java ArrayList forEach() Method :

Until all elements have been processed or the action throws an exception, the given action is carried out on each Iterable element. Actions are carried out in the iteration order (if one is specified), unless the implementing class specifies otherwise. The action relays any exceptions it throws to the caller.

Syntax :

public void forEach(Consumer action)

Parameters : action - The action to be performed for each element

Throws Exception : If the action that is specified is null, this method throws a NullPointerException.

Return Value : This method does not returns anything.

clear() Function in ArrayList

clone() Function in ArrayList

add() Function in ArrayList

addall() Function in ArrayList

Example 1 :

Run

import java.util.*;
public class Main{
    public static void main(String[] args) {
        
        //ArrayList object creation
        ArrayList<String> list = new ArrayList<>();

        //Adding elements to the list
        list.add("A");
        list.add("B");
        list.add("C");
        list.add("D");
        list.add("E");
        list.add("F");

        //Printing the initial list.
        System.out.println("ArrayList : " + list);

        //Using forEach() method to iterate through the list.
        list.forEach((n) -> System.out.println(n));
    }
}

Output :

ArrayList : [A, B, C, D, E, F]
A
B
C
D
E
F

Explanation : The forEach() method of an ArrayList is an advanced form of the for loop that is used in the example above. We added elements to the ArrayList first, then used the forEach() method to iterate through each element of the ArrayList and print the output one by one.

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