How to iterate a List of objects using forEach and Lambda in Java 8

How to iterate a List of objects using forEach and Lambda in Java 8

Prior to Java 8, iterating over a list of object was done using normal for loop or advanced for loop in case of Generics collection. In Java 8, forEach method of a List interface is used to iterate over the list of objects.

forEach method takes a single parameter that is actual object type of which the collection or list object is made of.

Below is the example of the same. Here is a Person class with name, age & address property. The main program creates 3 objects of Person class and iterate over the list using forEach method and prints the age of each person.

Person.java

package com.pojo;

public class Person {

 private String id;

 private String name;

 private String address;

 private int age;

 public int getAge() {
  return age;
 }

 public void setAge(int age) {
  this.age = age;
 }

 public String getId() {
  return id;
 }

 public void setId(String id) {
  this.id = id;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getAddress() {
  return address;
 }

 public void setAddress(String address) {
  this.address = address;
 }
}

IterateList.java

package com.lambda;

import java.util.ArrayList;
import java.util.List;

import com.pojo.Person;

public class IterateList {

 public static void main(String args[]) {

  List<Person> persons = new ArrayList<>();

  Person person = new Person();
  person.setAge(20);
  persons.add(person);

  Person personOne = new Person();
  personOne.setAge(25);
  persons.add(personOne);

  Person personTwo = new Person();
  personTwo.setAge(32);
  persons.add(personTwo);

  Person personThree = new Person();
  personThree.setAge(14);
  persons.add(personThree);

  persons.forEach(personObject -> {
   System.out.println("Person Name - " + personObject.getAge());
  });
 }
}