person.java

package com.alex.constructors;

class Person {

    String name;
    String surname;
    int age;

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

    Person(String n) {
        name = n;
        surname = "Иванов";
        age = 30;
    }

    Person(String n, String s) {
        name = n;
        surname = s;
        age = 30;
    }

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

    Person(String n, int a) {
        name = n;
        surname = "Иванов";
        age = a;
    }

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

class Program {

    public static void main(String[] args) {
        Person people[] = new Person[5];
        people[0] = new Person();
        people[1] = new Person("Нео");
        people[2] = new Person("Павел", "Дуров");
        people[3] = new Person("Марк", "Цукерберг", 37);
        people[4] = new Person("Морфеус", 48);
        for (Person p : people) {
            p.print();
        }
    }
}