Need help filling in the areas, unsure of how to do the code, JAVA. I've highlited what needs completing. 

import java.util.Arrays; import java.util.ArrayList; /** Testing the Person class that implements Comparable to see that the sorting is from young to old. */ public class PersonSorterByName { public static void main(String[] args) { Person[] persons = { new Person("Elvis", "Goodyear", 56), new Person("Stanley", "Clark", 8), new Person("Jane", "Graff", 16), new Person("Nancy", "Goodyear", 69), new Person("Alice", "Goodyear", 100) } ; System.out.println("Initial Order:"); for (int i = 0 ; i < 5; i ++) { Person person = persons[i]; String lastName = person.getLastName(); String firstName = person.getFirstName(); int age = person.getAge(); System.out.println(lastName + ", " + firstName + ". Age:" + age); } Arrays.sort(persons); System.out.println(); System.out.println("Sorted by name (alphabetically):"); for (int i=0; i<4; i++) { Person person = persons[i]; String lastName = person.getLastName(); String firstName = person.getFirstName(); int age = person.getAge(); System.out.println(lastName + ", " + firstName + ". Age:" + age); } } } /** This class Person models a person object that has a name and age. Notice there is no constructor other than the default one. You are setting up the Comparable interface so that the sorting will be from young to old (ascending). */ //-----------Start below here. To do: approximate lines of code = 1 // Write the "class Person ... " part so that Comparable is implemented, but leave off the public specifier since only one class in a file can be public //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions. { private String firstName; private String lastName; private int age; /** Constructs a person object using name and age @param first the first name @param last the last name @param years the age in years */ public Person(String first, String last, int years) { firstName = first ; lastName = last ; age = years ; } /** Accesses the first name @return firstName */ public String getFirstName() { return firstName; } /** Sets the first name @param firstName the new first name */ public void setFirstName(String firstName) { this.firstName = firstName; } /** Accesses the last name @return lastName */ public String getLastName() { return lastName; } /** Sets the last name @param lastName the new value. */ public void setLastName(String lastName) { this.lastName = lastName; } /** Accesses the first age @return age */ public int getAge() { return age; } /** Sets the age @param age the new age */ public void setAge(int age) { this.age = age; } /** Compares this person with another in the form of Comparable interface. Sorting is alphabetical by last name but if the last name is the same, go by the first name @return -1 if this person's name comes before the other's name +1 if this person's name comes after the other's name 0 if the names are the same */  //-----------Start below here. To do: approximate lines of code = 5 // 1. write the compareTo method for the Comparable interface //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions. }