25 May Java simple program
CS 181 Homework-3 Dr. Chetan Jaiswal Spring 2018
Q1. (10 points)
Create a class called Invoice that a hardware store might use to represent an invoice for an item
sold at the store. An Invoice should include four pieces of information as instance variables—a
part number (type String), a part description (type String), a quantity of the item being purchased
(type int) and a price per item (double).
Your class should have two overloaded constructors: one as zero argument constructor and the
other as a 4 argument constructor, for initializing the instance variables.
Provide a set and a get method for each instance variable. In addition, provide a method named
getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price
per item), then returns the amount as a double value. If the quantity is not positive, it should be
set to 0. If the price per item is not positive, it should be set to 0.0.
Write a test application named InvoiceTest (a driver class) that demonstrates class Invoice’s
capabilities. Try and demonstrate use of all the constructors & methods in the class. Take print
screen of the output of the driver class.
Q2. (10 points)
Create a class called Date that includes three instance variables—a month (type int), a day (type
int) and a year (type int). Provide a three argument constructor that initializes the three instance
variables and assumes that the values provided are correct. Provide a set and a get method for
each instance variable. Provide a method displayDate that displays the month, day and year
separated by forward slashes (/).Write a test application named DateTest (a driver class) that
demonstrates class Date’s capabilities and the use of “this” reference. Try and demonstrate use of
all the constructors & methods in the class. Take print screen of the output of the driver class.
Instructions:
What to submit: All Source code + print screen of the output of the driver class
When to submit: Midnight, Mar 1 2018.
Where to submit: Blackboard->Assignments
Format: PDF
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