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ArrayList forEach() Method in Java

Last Updated : 11 Jul, 2025

In Java, the ArrayList.forEach() method is used to iterate over each element of an ArrayList and perform certain operations for each element in ArrayList.

Example 1: Here, we will use the forEach() method to print all elements of an ArrayList of Strings.

// Java program to demonstrate the use of forEach() 
// with an ArrayList of Strings
import java.util.ArrayList;

public class GFG {
    public static void main(String[] args) {

        // Create an ArrayList of Strings
        ArrayList<String> s = new ArrayList<>();
        s.add("Cherry");
        s.add("Blueberry");
        s.add("Strawberry");

        // Use forEach() to print each fruit
        s.forEach(System.out::println);
    }
}

Cherry
Blueberry
Strawberry

Explanation: In the above example, we use the forEach() method with a method reference (System.out::println) to print each element in the ArrayList.

public void forEach(Consumer<? super E> action)

Parameter: action: A functional interface "Consumer" that specifies the action to be performed for each element in the ArrayList. It accepts a single parameter and does not return any value.

Exception: This method throws NullPointerException if the specified action is null.

Example 2: Here, we will use the forEach() method with a lambda expression to print the square of each element in an ArrayList of Integers.

// Java program to demonstrate 
// custom actions using forEach()
import java.util.ArrayList;

public class GFG {
    public static void main(String[] args) {

        // Create an ArrayList of Integers
        ArrayList<Integer> n = new ArrayList<>();
        n.add(2);
        n.add(3);
        n.add(4);

        // Use forEach() to print the 
        // square of each number
        n.forEach(num -> System.out.println(num * num));
    }
}

Example 3: Here, we will use the forEach() method with a conditional statement to filter and print eligible elements of an ArrayList of Integers.

// Java program to demonstrate 
// conditional actions using forEach()
import java.util.ArrayList;

public class GFG {
    public static void main(String[] args) {

        // Create an ArrayList of Integers
        ArrayList<Integer> a = new ArrayList<>();
        a.add(24);
        a.add(18);
        a.add(10);

        // Use forEach() to print 
        // ages that are 18 or above
        a.forEach(age -> {
            if (age >= 18) {
                System.out.println("Eligible age: " + age);
            }
        });
    }
}

Eligible age: 24
Eligible age: 18

Explanation: In the above example, we use the forEach() method with a lambda expression and conditional logic to filter and print elements based on a condition.

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