Package Delivery Services $$ Using Inheritance

Overview and Problem Description

Package delivery services like FedEx etc offer a number of different delivery

options each with a specific cost associated with it$.$ Create an inheritance

hierarchy to represent various types of packages. The Base class is called

Package and there are two derived classes called TwoDayPackage and

OvernightPackage.

The UML diagram for the Package is given below.

Package

$-$name: String

$-$address: String

$-$city: String

$-$state: String

$-$ZIP: String

$-$weight$\_$in$\_$ounces: double

$-$cost$\_$per$\_$ounce: double

$+$Package$($String name, String address, String city, String state, String

ZIP, double weight$\_$in$\_$ounces, double cost$\_$per$\_$ounce$)//$ constructor

$+$calculateCost$()$: double $//$ returns weight times cost

The derived class TwoDayPackage inherits from Package. In addition, it has a

field called flatfee that represents the flat rate that is charged for shipping

via this method. This class also redefines the calculateCost function to add

flatfee to the calculated cost done by the base Package class. Set the flatfee

to $$3\mathrm{.}50$ and initialize in the derived class constructor

The derived class TwoDayPackage inherits from Package. In addition, it has a

field called flatfee that represents the flat rate that is charged for shipping

via this method. This class also redefines the calculateCost function to add

the additional cost per ounce for overnight shipping to the standard

calculated cost done by the base Package class.

The derived class OvernightPackage inherits from Package. In addition, it has

a field called overnightFee that represents the additional fee per ounce that

is charged for shipping via this method. This class also redefines the

calculateCost function to add flatfee to the calculated cost done by the base

Package class.

The toString method of the Package class is redefined by toString methods of

both derived classes.

Cost of Shipping per ounce $=0\mathrm{.}67$ cents

Flat fee for two day shipping is $3\mathrm{.}50$

Fee for overnight shipping $=0\mathrm{.}45$ cents

What to do$?$

A$.$ Complete the UML diagram to include TwoDayPackage and Overnight

Package.

Make sure to add constructors, fields and methods appropriately

An example of how to do this is given below.

Here is a link to more learning material.

UML for Inheritance Relationships

Here is an example of how inheritance relationships can be represented using UML

Generalization: A class extends another class. For example, the Book class

might extend the Document class, which also might include the Email class.

The Book and Email classes inherit the fields and methods of the Document

class $($possibly modifying the methods$),$ but might add additional fields and

methods.

UML for Inheritance Classes Example: Here is an example UML for

inheritance classes. Document is the Base Class and Book and Email both are

derived classes that inherit from Document

write it in java