Problem

Design and implement these $4$ files:

A parent class called Purchase with item name, and price

attributes $($this class will represent a purchase you made while

shopping at a grocery store $($for example Walmart or Superstore$))$

Produce inherits from Purchase and adds a unit attribute $($is the

inherited price per kilogram? or for each item $($celery stalk$),$ etc$)$

Cereal inherits from Purchase and adds a package size attribute

$($eg $500gms)$

A driver file to test the $3$ classes above

The Purchase, Produce and Cereal classes should have the usual

constructors $($default and parameterized$),$ an accessor method for

each attribute, a mutator method for each attribute, and a toString

method.

Child classes should call parent methods whenever possible to

minimize code duplication.

The driver program must test all the methods in each of the

classes. Include comments in your output to describe what you are

testing, for example System.out.println$("$testing Purchase

toString"$)$;$.$ Print out some blank lines in the output to make it

easier to read and understand what is beingoutput.