Main

package com.company;

public class Main {

    public static void main(String[] args) {
        Person[] persons = new Person[10];

        persons[0] = new Employee("Ivan", 33, true, 70);
        persons[1] = new Employee("Ana", 28, false, 75);
        persons[2] = new Person("Peter", 40, true);
        persons[3] = new Person("Mariika", 36, false);
        persons[4] = new Student("Gosho", 20, true, 4.50);
        persons[5] = new Student("Penka", 19, false, 5.99);

        for (Person person : persons) {
            if (person != null) {
                if (person.getClass().getTypeName().endsWith("Person")) {
                    person.showPersonInfo();
                } else if (person.getClass().getTypeName().endsWith("Student")) {
                    person.showStudentInfo();
                } else {
                    person.showEmployeeInfo();
                }
            }
        }

        for (Person person : persons) {
            if (person != null) {
                if (person.getClass().getTypeName().endsWith("Employee")) {
                    System.out.println("Salary for overtime: " + person.calculateOvertime(2) + "lv.");
                }
            }
        }

    }
}