Answer Happy

PROBLEM 1:
Your whole program should contain three java files:
Hw6.java, Stock.java,
UsedStock.java.

Assume, you are a manager of BP car dealership and want to develop
inventory management system.
Develop your inventory management system following the steps
below.

Step 1: Stock class (10pt)

This class is for the new vehicle inventory that your dealership
directly purchases from BP motor. Create
a class called Stock and save it in Stock.java.

The class has the following (private) instance variables:
• An integer variable for stock ID;
• A double variable for purchase price;
The class has the following (public) instance methods:
• Constructor method (Version 1), with no argument:
o Simply set stock ID to 0, and set purchase price to 0;
• Constructor method (Version 2), with two arguments: one for stock
ID, one for purchase price
o Set the stock ID and the purchase price equal to the parameter
values;
• A method to set the stock ID;
• A method to set the purchase price;
• A method to retrieve the stock ID;
• A method to retrieve the purchase price;
• A method to print stock information:
o Print stock ID and purchase price in one line, in a properly
aligned format (see the
screenshot in Step 2; use printf).

Step 2: UsedStock class (10pt)

This class is for the used vehicle inventory that your dealership
purchases from consumers whey they buy
a new car. However, you may need to repair the used vehicle and the
repair costs should be recorded as
well. Create a class called UsedStock and save it in
UsedStock.java.

The UsedStock class inherits from the general Stock class.
• It has an additional (private) double variable, which records the
repair cost.

In addition, you need to define the following methods for the
UsedStock class:
• Constructor method, with three parameters: stock ID (int),
purchase price (double), and repair cost
(double)
o Note: Think carefully how to initialize stock ID and purchase
price, as they are private
variables of the superclass (i.e. Stock class).
• Override the method that prints stock information
o For a used stock, in addition to printing its stock ID and
purchase price, also display the
repair cost as follows: “(Repair cost; $600)”
o Note: The string “Repair cost” can be displayed as is (i.e. you
don’t need to create a variable
for it); the actual dollar amount (e.g. 600) needs to be the value
of the double variable.
o Note: Think carefully how to print stock ID and purchase price as
they are private variables.

Step 3: Program Entry Point: Main Method (10pt)

Create a class called Hw6 that only contains the main method as the
entry point of your whole JAVA
program. Save the class in Hw6.java.

In your main method, do the following:
• Create an array of 5 Stock objects;
• Create each of the array elements as follows:
o Instantiate the first array element by using the constructor
method (Version 2) to create a
Stock object with stock ID 1001, and purchase price 15342.68;
o Instantiate the second array element by using the constructor
method (Version 2) to create
a Stock object with stock ID 1002, and purchase price
14112.56;
o Instantiate the third array element by using the constructor
method (Version 1) to create a
(blank) Stock object. Then call the “setter” methods to set the
stock ID to 1003 and the
purchase price 16121.55;
o Instantiate the fourth array element by using the constructor
method (Version 1) to create
a (blank) Stock object. Then call the “setter” methods to set the
stock ID to 1004 and the
purchase price 12756.18;
o Instantiate the fifth array element by creating a UsedStock
object with Stock ID 1005,
purchase price 6576.33, and repair cost 500;
o Use the for loop to print out all five stocks’ information. In
each loop iteration, let one array
element call the print method.

Your program should have the following output:
GV. Command Prompt Microsoft Windows [Version 10.0.18362.1016] (C) 2019 Microsoft Corporation. All rights reserved. C:\Userstang>javac Hw6.java C:WUserslKang>java Hw6 Stock ID: 1001Purchase Price: $15342.68 Stock ID: 1002 Purchase Price: $14112.56 Stock 10: 1003 Purchase Price: $16121.55 Stock ID: 1004 Purchase Price: $12756.18 Stock 10: 1005 Purchase Price: $6576.33 (Repair cost; $500.00) C:WUsershkang