In Fig. 8.8, class Employee’s instance variables are never modified after they’re initialized. Any such instance variable should be declared final. Modify class Employee accordingly, then compile and run the program again to demonstrate that it produces the same results.

Fig. 8.8

I // Fig. 8.8: Employee.java 2 // Employee class with references to other objects. 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 public class Employee { } private String firstName; private String lastName; private Date birthDate; private Date hireDate; // constructor to initialize name, birth date and hire date public Employee (String firstName, String lastName, Date birthDate, Date hireDate) { this.firstName = firstName; this.lastName = lastName; this.birthDate = birthDate; this.hireDate= hireDate; } // convert Employee to String format public String toString() { return String.format ("%s , %s Hired: %s Birthday: %s", lastName, firstName, hireDate, birthDate); }