Java ArrayList forEach() Method

Example

Use a lambda expression in the ArrayList's forEach() method to print every item in the list:

import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    ArrayList<Integer> numbers = new ArrayList<Integer>();
    numbers.add(5);
    numbers.add(9);
    numbers.add(8);
    numbers.add(1);
    numbers.forEach( (n) -> { System.out.println(n); } );
  }
}

Definition and Usage

The forEach() method performs an action on every item in a list. The action can be defined by a lambda expression that is compatible with the accept() method of Java's Consumer interface.

To learn about lambda expressions, see the Java Lambda Expression tutorial.

Syntax

public void forEach(Consumer action)

Parameter Values

Related Pages

• Java Arrays Tutorial
• Java ArrayList Tutorial
• Java Lambda Expressions Tutorial