How to Filter a List of Person Objects Based on Name and Age Using Java 8 Streams

In Java 8, the introduction of Streams brought a powerful and expressive way to process collections of objects. This article will walk you through filtering a list of Person objects based on certain criteria, such as name and age, and also demonstrate how to filter objects using two boolean conditions.

Java 8 Stream API [Solutions]

Filtering Based on Name and Age

Let’s start by filtering a list of Person objects to find those whose name is "Raja" and whose age is greater than 50.

import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;

public class CollectionFilterExample {
    public static void main(String[] args) {
        List<Person> list = Arrays.asList(
            new Person("Sanjay", 1, 20),
            new Person("Mohan", 2, 30),
            new Person("Mohan", 8, 60),
            new Person("Raja", 14, 40),
            new Person("Anu", 9, 70),
            new Person("Raja", 15, 70)
        );

        Predicate<Person> filterName = person -> person.getName().equals("Raja");
        Predicate<Person> filterAge = person -> person.getAge() > 50;

        List<Person> filteredPersons = list.stream()
            .filter(filterName.and(filterAge))
            .collect(Collectors.toList());

        filteredPersons.forEach(System.out::println);
    }
}