Payroll System Using Inheritance and Polymorphism in Java 1. Implement an interf

Question

Payroll System Using Inheritance and Polymorphism in Java

1. Implement an interface called EmployeeInfo with the following constant variables:

FACULTY_MONTHLY_SALARY = 6000.00

STAFF_MONTHLY_HOURS_WORKED = 160

2. Implement an abstract class Employee with the following requirements:

Attributes

last name (String)

first name (String)

ID number (String)

Sex - M or F

Birth date - Use the Calendar Java class to create a date object

Default argument constructor and argument constructors.

Public methods

toString - returning a string with the following format:
ID Employee number :_________
Employee name: __________
Birth date: _______

mutators and accessors

abstract method monthlyEarning that returns the monthly earning.

3. Implement a class called Staff extending from the class Employee with the following requirements:

Attribute

Hourly rate

Default argument and argument contructors

Public methods

get and set

The method monthlyEarning returns monthly salary (hourly rate times 160)

toString - returning a string with the following format:
ID Employee number :_________
Employee name: __________
Birth date: _______
Full Time
Monthly Salary: _________

Implelment a class Education with the following requirements:

Attributes

Degree (MS or PhD )

Major (Engineering, Chemistry, English, etc ... )

Research (number of researches)

Default argument and argument constructors.

Public methods

get and set

Implement a class Faculty extending from the class Employee with the following requirements:

Attributes

Level (Use enum Java)
"AS": assistant professor
"AO": associate professor
"FU": professor

Education object

Default argument and argument constructor

Public methods

mutators and accessors

The method monthlyEarning returns monthly salary based on the faculty's level.
AS - faculty monthly salary
AO - 1.5 times faculty monthly salary
FU - 2.0 times faculty monthly salary

toString - returning a string with the following format:
ID Employee number :_________
Employee name: __________
Birth date: _______
XXXXX Professor where XXXXX can be Assistant, Associate or Full
Monthly Salary: _________

Implement a class called Partime extending from the class Staff with the following requirements:

Attributes

Hours worked per week

Default argument and argument constructors

Public methods

mutators and accessors

The method monthlyEarning returns monthly salary . The monthly salary is equal to hourly rate times the hours worked in four weeks.

toString - returning a string with the following format:
ID Employee number :_________
Employee name: __________
Birth date: _______
Hours works per month: ______
Monthly Salary: _________

mplement a test driver program that creates a one-dimensional array of class Employee to store the objects Staff, Faculty and Partime.

Using polymorphism, display the following outputs:

a. Employee information using the method toString

Staff

Faculty

Part-time

b. Total monthly salary for all the part-time staff .
c. Total monthly salary for all employees.
d. Display all employee information descending by employee id using interface Comparable
e. Display all employee information ascending by last name using interface Comparer
f. Duplicate a faculty object using clone. Verify the duplication.

Test Data

Staff

Last name: Allen
First name: Paita
ID: 123
Sex: M
Birth date: 2/23/59
Hourly rate: $50.00

Last name: Zapata
First Name: Steven
ID: 456
Sex: F
Birth date: 7/12/64
Hourly rate: $35.00

Last name:Rios
First name:Enrique
ID: 789
Sex: M
Birth date: 6/2/70
Hourly rate: $40.00

Faculty

Last name: Johnson
First name: Anne
ID: 243
Sex: F
Birth date: 4/27/62
Level: Full
Degree: Ph.D
Major: Engineering
Reseach: 3

Last name: Bouris
First name: William
ID: 791
Sex: F
Birth date: 3/14/75
Level: Associate
Degree: Ph.D
Major: English
Reseach: 1

Last name: Andrade
First name: Christopher
ID: 623
Sex: F
Birth date: 5/22/80
Level: Assistant
Degree: MS
Major: Physical Education
Research: 0

Explanation / Answer

Payroll System Using Polymorphism

This section reexamines the CommissionEmployee-BasePlusCommissionEmployee hierarchy that we explored throughout Section 9.4. Now we use an abstract method and polymorphism to perform payroll calculations based on the type of employee. We create an enhanced employee hierarchy to solve the following problem:

We use abstract class Employee to represent the general concept of an employee. The classes that extend Employee are SalariedEmployee, CommissionEmployee and HourlyEmployee. Class BasePlusCommissionEmployee—which extends CommissionEmployee—represents the last employee type. The UML class diagram in Fig. 10.2 shows the inheritance hierarchy for our polymorphic employee-payroll application. Note that abstract class Employee is italicized, as per the convention of the UML.

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