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 $500$ gms$)$

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.