How to filter a List with Java Stream?

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


class Person {
	private Integer age;
	private String name;
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Person(Integer age, String name) {
		super();
		this.age = age;
		this.name = name;
	}
	@Override
	public String toString() {
		return "Person [age=" + age + ", name=" + name + "]";
	}

}

public class JavaStreamFilter {

	public static void main(String[] args) {

		List<Person> people = getArrayList();
		List<Person> oldPeople = people.stream().filter(p -> p.getAge() > 30).collect(Collectors.toList());
		System.out.println("\nThe sorted list:");
		displayList(oldPeople);
	}

	private static void displayList(List<Person> people) {

		for (Person p : people) {
			System.out.println(p);
		}
	}

	private static List<Person> getArrayList() {
		List<Person> people = new ArrayList<Person>();
		Person person1 = new Person(21, "Jack Lee");
		people.add(person1);
		Person person2 = new Person(31, "Jack Ma");
		people.add(person2);
		Person person3 = new Person(12, "Steve Liu");
		people.add(person3);
		Person person4 = new Person(42, "Alice XU");
		people.add(person4);

		return people;
	}




The result is: 
The sorted list:
Person [age=31, name=Jack Ma]
Person [age=42, name=Alice XU]