public class Employee {
    //static long nextId;
    long id;
    String firstName;
    String lastName;
    double salary;
    int age;

    Employee() {

    }

    Employee(long newId, String newFirstName, String newLastName, int newAge, double newSalary) {
        id = newId;
        firstName = newFirstName;
        lastName = newLastName;
        age = newAge;
        salary = newSalary;
    }

    void printInfo() {
        System.out.print("id = " + id);
        System.out.print(", first name = " + firstName);
        System.out.print(", last name = " + lastName);
        System.out.print(", salary = " + salary);
        System.out.println(", age = " + age);
    }

    double calculateBonus() {
        return salary * Math.random() * age;
    }

}