Person

package org.example;
import java.util.Comparator;
import java.util.Objects;

public class Person implements Comparable<Person> {

    protected String name;
    public int age;

    public Person(String name, int age) { // конструктор

        if (name.length() < 2)
            throw new IllegalArgumentException("Name should have > 2 letters");
        if (age < 0)
            throw new IllegalArgumentException("Age can't be < 0");

        this.name = name;
        this.age = age;
    }

    public String getName() { // гетер імені
        return name;
    }

    public int getAge() { // гетер віку
        return age;
    }

    public void setName(String name) {
        if (name.length() < 2 || name.isEmpty())
            throw new IllegalArgumentException("Name should have > 2 letters");

        this.name = name;
    }

    public void setAge(int age) {
        if (age < 0)
            throw new IllegalArgumentException("Age can't be < 0");

        this.age = age;
    }

    @Override
    public String toString() { // метод для отримання рядкового представлення об'єкта toString
        return "Hey! " +
                "I'm " + name +
                ", my age is " + age;
    }

    @Override
    public int compareTo(Person people) {
        Objects.requireNonNull(people);

        if(this.age == people.getAge()) {
            return 0;
        } else if (this.age < people.getAge()){
            return -1;
        } else {
            return 1;
        }
    }
}