You are writing the application that deals with information about Person at College.

$2\mathrm{.}1$ Enum classes

You should create two enumeration classes Sex and Level.

The enumeration class Sex has only two elements: MALE and FEMALE.

The enumeration class Level has following elements: ESL$1$A$,$ ESL$1$B$,$ ESL$2$A$,$ ESL$2$B$,$ ESL$3$A$,$ ESL$3$B$,$ ESL$4$A$,$

ESL$4$B$,$ ESL$5$A$,$ ESL$5$B$,$ ESL$6$A$,$ ESL$6$B$.$

$2\mathrm{.}2$ Interfaces and Classes

For every class, you should decide which private variables are needed. Also, don$$t forget about

toString$()$ method.

$1$ Write an interface Person that requires the implementation of typical features that work with

First Name, Last Name, Id$,$ and Sex of person.

$2$ Write an abstract class Student. The constructor of this class gets parameters id$,$ first name,

last name, sex, and month, day, year of birth. In this class, you should realize all methods of the

interface. Also, this class includes one abstract method getPrice$(),$ and methods that set and

return credits of a student. A ESL student has every time $5$ credits.

$3$ Write the ESL class that is a subclass of a Student. The getPrice$()$ method returns $$25\mathrm{.}0$ every

time. The constructor of this class gets parameters: id$,$ first name, last name, day, month,

year, sex, level.

$4$ Write the ESLStudents class. This class must contain ArrayList of ESL students and have

methods which let to add a student, remove a student with a specific index, return numbers

of students, return ESL student that has a specific index. Also, this class must have a method

that called isFound$().$ This method gets the id of a student and returns the index of this

$2$

student or $-1$ if this id doesn't exist. Besides, you should realize a method that gets a level and

returns how many students have this level.

$5$ Write the College class that is a subclass of a Student. The getPrice$()$ method returns a value

equals the cost of the one credit multiply by the number of credits.

$6$ Write the CollegeStudents class. This class must contain ArrayList of College students and

have methods which let to add a student, remove a student with a specific index, return

numbers of students, return a College student that has a specific index. Also, this class must

have a method that called isFound$().$ This method gets the id of a student and returns the

index of this student or $-1$ if this id doesn't exist. Besides, you should realize a method that

returns how many full$-$time students there are. A full$-$time student must have $13$ or more

credits.

$2\mathrm{.}3$ toString$()$ method

At the topmost class, create a toString$()$ method that supplies all the information it knows about the

students. In each subclass that adds information of interest, concatenate that information to the

string created by its superclass.

$3$ General

$$ We don$$t need a variety of constructors here; create constructors that include everything needed.