person.java

package com.alex.constructors;

import java.util.Arrays;

class Person {

    String name;
    String surname;
    int age;

    Person() {
        this("Иван");
    }

    Person(String n) {
        this(n, "Иванов");
    }

    Person(String n, String s) {
        this(n, s, 25);
    }

    // main c-tor
    Person(String n, String s, int a) {
        name = n;
        surname = s;
        age = a;
    }

    Person(String n, int a) {
        this(n, "Иванов", a);
    }

    void print() {
        System.out.println(toString());
    }

    public String toString() {
        return "\n" + name + " " + surname + ", " + age + " лет\n";
    }
}

class Program {

    public static void main(String[] args) {
        Person people[] = {
            new Person(),
            new Person("Василий"),
            new Person("Пётр", "Петров"),
            new Person("Борис", "Борисов", 37),
            new Person("Валерий", 48)};

        System.out.println(Arrays.asList(people));
    }
}