Question

Programming Assignment 6: Object Oriented Programming

Due date: Check Syllabus and Canvas

Objectives: After successfully completing this assignment, students will practice Object Oriented design and

programming by creating a Java program that will implement Object Oriented basic concepts.

RetailItem Class:

Part 1: Write a class named RetailItem that holds data about an item in a retail store. The class should have the

following fields:

• description. The description field references a String object that holds a brief description of the item.

• unitsOnHand. The unitsOnHand field is an int variable that holds the numbers of units currently in inventory.

• price. The price filed is a double that holds the item's retail price.

Write a constructor that accepts arguments for each field, appropriate mutator methods that store values in these

fields, and accessor methods that returns the values in these fields.

After this, write a method in the RetailItem class called purchaseItem. This method will be used to simulate an item(s)

purchase. It will accept as a parameter the variable totalItemsToPurchase representing a number of units to buy (e.g.

10). The method should check if its unitsOnHand is enough to satisfy the purchase. If it is not, notify the user. If it is

enough, update unitsOnHand with the new value (unitsOnHand – totalItemsToPurchase) and return to the user the total

cost of the purchase (itemsToPurchase * price).

Hint: remember you can use the this instruction to access member variables inside a class

Once you have written the class, write a driver class that creates three RetailItem objects and stores the following data

in them:

Description (object’s name) Units on Hand Price

Jacket 12 59.95

Shoes 40 34.95

Pants 20 24.95

Use the accessor methods you created to display the initial value of all three items. Then, simulate purchases by calling

the purchaseItem method for each object following the list below:

Description (object’s name) totalItemsToPurchase

Jacket 10

Shoes 20

Pants 5

Jacket 5

Shoes 10

Pants 3

Run/test the program and save the output as a comment at the end of your cod

Answer 1

Screenshot

Program

RetailItem.java

/**
* Create a class to keep retail store items details
* @author deept
*
*/
public class RetailItem {
   //Attributes
   private String description;
   private int unitsOnHand;
   private double price;
   //Constructor set values of attributes
   public RetailItem(String desc,int units,double pr) {
       setDescription(desc);
       setUnitsOnHand(units);
       setPrice(pr);
   }
   //Mutators
   public void setDescription(String description) {
       this.description = description;
   }
   public void setUnitsOnHand(int unitsOnHand) {
       if(unitsOnHand<0) {
           this.unitsOnHand = 0;
       }
       else {
           this.unitsOnHand = unitsOnHand;
       }
   }
   public void setPrice(double price) {
       if(price<0) {
           this.price=0;
       }
       else {
           this.price=price;
       }
   }
   //Accessors
   public String getDescription() {
       return description;
   }
   public int getUnitsOnHand() {
       return unitsOnHand;
   }
   public double getPrice() {
       return price;
   }
   //Method to purchase item from store
   public void purchaseItem(int totalItemsToPurchase) {
       if( totalItemsToPurchase<=unitsOnHand) {
           unitsOnHand-= totalItemsToPurchase;
           System.out.printf("%-20s%.2f\n",description,totalItemsToPurchase*price);
       }
       else {
           System.out.println("Item not enough to purchase!!!");
       }
   }
}

RetailItemDriver.java

/**
* Test class to check RetailItem class
* @author deept
*
*/
public class RetailItemDriver {

   public static void main(String[] args) {
       // Create 3 RetailItem objects
       RetailItem item1=new RetailItem("Jacket",12,59.95);
       RetailItem item2=new RetailItem("Shoes",40,34.95);
       RetailItem item3=new RetailItem("Pants",20,24.95);
       //Display initial details of items
       System.out.println("Description   Units on Hand   Price");
       System.out.printf("%-20s%-10d%.2f\n",item1.getDescription(),item1.getUnitsOnHand(),item1.getPrice());
       System.out.printf("%-20s%-10d%.2f\n",item2.getDescription(),item2.getUnitsOnHand(),item2.getPrice());
       System.out.printf("%-20s%-10d%.2f\n",item3.getDescription(),item3.getUnitsOnHand(),item3.getPrice());
       //Purchase the following items
       System.out.println();
       System.out.printf("%-20s%s\n","Description","Purchase Cost");
       //Jacket 10
       item1.purchaseItem(10);
       //Shoes 20
       item2.purchaseItem(20);
       //Pants 5
       item3.purchaseItem(5);
       //Jacket 5
       item1.purchaseItem(5);
       //Shoes 10
       item2.purchaseItem(10);
       //Pants 3
       item3.purchaseItem(3);
   }
}

Output

Description   Units on Hand   Price
Jacket              12        59.95
Shoes               40        34.95
Pants               20        24.95

Description         Purchase Cost
Jacket              599.50
Shoes               699.00
Pants               124.75
Item not enough to purchase!!!
Shoes               349.50
Pants               74.85