finalize

person.java

package com.alex.destructors;

class Person {

    String name;
    String surname;
    int age;

    Person() { // конструктор без параметров
        name = "Иван";
        surname = "Иванов";
        age = 30;
    }

    Person(int number) {
        age = number;
    }

    Person(String n, String s, int a) { // конструктор с параметрами
        name = n;
        surname = s;
        age = a;
    }

    void print() {
        System.out.println(name + " " + surname + ", " + age + " лет.");
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        System.out.println("Object #" + age);
    }

}

class Program {

    public static void main(String[] args) {
        int count = 100000;
        for (int i = 0; i < count; i++) {
            Person p = new Person(i);
        }
    }
}