this example

Person.java

package com.alex.encapsulation;

class Person {

    Person ref = this;
    
    String name;
    String surname;
    int age;

    Person(String name, String surname, int age) {
        // name = name; // "мантричний" код???
        this.name = name;
        this.surname = surname;
        this.age = age;
    }

    void print() {
        // System.out.println(name + " " + surname + ", " + age + " років");
        System.out.println(this); // System.out.println(ref);
        // this = new Person(); // cannot assign a value to final variable this!
    }

}

class Program {

    public static void main(String[] args) {

        Person p = new Person("Олександр", "Загоруйко", 36);

        System.out.println(p);
        p.print();
        // Person.print(p);
    }
}