Question

Develop a program to emulate a purchase transaction at a retail storeThis program will have two classes, a Lineltem class and a Transaction class. The Lineltem class will represent an individua line item of merchandise that a customer is purchasing. The Transaction class will combine several Lineltem objects and calculate an overall total price for the line item within the transaction. There will also be two test classes, one for the Lineltem class and one for the Transaction class. Design and build a Lineltem class. This class will have three instance variables. There will be an itemName variable that will hold the identification of the line item (such as, "Colgate Toothpaste): a quantity variable that will hold the quantity of the item being purchased; and a price variable that will hold the retail price of the item. The Lineltem class should have a constructor, accessors for the instance variables, a method to compute the total price for the line item, a method to update the quantity, and a method to convert the state of the object to a string. Using Unified Modeling Language (UML), the class diagram looks like this: Lineltem itemName: String quantity int price double Lineltem( String, int, double) getName(): String get Quantity(): int getPrice( double getTotal Price(): double setQuantity (int) setPrice( double) toString(): String

Answer 1

R Markers Properties Servers膼Data Source Explorer la Snippets 旦Console X Search <terminated> TransctionDemo [Java Application] C:AProgram FilesJava\jre1.8.0_73 binljavaw.exe (Dec 16, 2016, 9:37:47 AM Customer ID 123456 Customer Nameohn Doe Colgate Toothpaste Bounty Paper Towels Kleenex Tissue Transaction Total qty 2 $2.99 qty 1 $1.49 qty 1 $2.49 $9.96 $5.98 $1.49 $2.49 Customer ID 123456 Customer Nameohn Doe Colgate Toothpaste Bounty Paper Towels Kleenex Tissue Transaction Total gty 3 $2.99 qty 1 $1.49 qty 1 $2.49 $12.95 $8.97 $1.49 $2.49

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public class LineItem {

   // Declare all required variables
   private String itemName;
   private int quantity;
   private double price;

   // Parameterized constructor
   public LineItem(String itemName, int quantity, double price) {
       this.itemName = itemName;
       this.quantity = quantity;
       this.price = price;
   }

   // Getter method for ItemName
   public String getItemName() {
       return itemName;
   }

   // Getter method for quantity
   public int getQuantity() {
       return quantity;
   }

   // Getter method for price
   public double getPrice() {
       return price;
   }

   // Getter method Total Price
   public double getTotalPrice() {
       double totalPrice;
       totalPrice = quantity * price;
       return totalPrice;
   }

   // Setter method to set quantity
   public void setQuantity(int x) {
       quantity = x;
   }

   // Setter method to set price
   public void setPrice(double y) {
       price = y;
   }

   // toString() to get line item description
   public String toString() {
       String lineItemDescription;
       lineItemDescription = (itemName + "\t\t\tqty " + quantity + " @ $" + price + "\t\t" + "$" + getTotalPrice());
       return lineItemDescription;
   }
}

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import java.text.DecimalFormat;
import java.util.ArrayList;

public class Transaction {

   // Declare all required variables
   private ArrayList<LineItem> lineItems;
   private int customerID;
   private String customerName;
   DecimalFormat decimalFormat = new DecimalFormat("#.##");

   // Parameterized constructor
   public Transaction(int customerID, String customerName) {

       this.customerID = customerID;
       this.customerName = customerName;

       // Create ArrayList object and assign to lineItems
       lineItems = new ArrayList<LineItem>();
   }

   // Method to add lineItem
   public void addLineItem(String itemName, int quantity, double price) {

       // Create line item object by passing itemName, quantity, price
       LineItem lineItem = new LineItem(itemName, quantity, price);

       // Add lineItem to lineItems
       lineItems.add(lineItem);
   }

   // Method to update line item
   public void updateItem(String itemName, int quantity, double price) {

       boolean isFound = false;
       LineItem lineItem = null;

       // Find the line item by itemName
       for (int i = 0; i < lineItems.size(); i++) {
           lineItem = lineItems.get(i);
           if (lineItem.getItemName().equalsIgnoreCase(itemName)) {
               isFound = true;
               break;
           }
       }

       // Check if line item found or not, if found update quantity
       if (isFound) {
           lineItem.setQuantity(quantity);
       } else {
           System.out.println("Line item not found with given item name!");
       }
   }

   // Method to get Total price
   public double getTotalPrice() {

       double totalPriceOfLineItems = 0;

       // Iterate over all line items
       for (int i = 0; i < lineItems.size(); i++) {
           totalPriceOfLineItems = totalPriceOfLineItems + lineItems.get(i).getTotalPrice();
       }

       return totalPriceOfLineItems;
   }

   // Get Line item by item name
   public String getLineItem(String itemName) {

       boolean isFound = false;
       LineItem lineItem = null;

       // Find the line item by itemName
       for (int i = 0; i < lineItems.size(); i++) {
           lineItem = lineItems.get(i);
           if (lineItem.getItemName().equalsIgnoreCase(itemName)) {
               isFound = true;
               break;
           }
       }

       // Check if line item found or not
       if (isFound) {
           return lineItem.toString();
       } else {
           return "Line item not found with given item name!";
       }
   }

   // toString() method to return transaction description
   public String toString() {

       String transctionDescription;
      
       //Get line items description
       String linItemsDescription = "";
       for(int i=0;i<lineItems.size();i++) {
           linItemsDescription = linItemsDescription + lineItems.get(i).toString() + "\n";
       }
      
       transctionDescription = "Customer ID : " + customerID + "\nCustomer Name : " + customerName + "\n"
               + linItemsDescription + "Transaction Total : \t\t\t$" + decimalFormat.format(getTotalPrice());
      
       return transctionDescription;
   }

}

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public class TransctionDemo {

   public static void main(String[] args) {
      
       //Create Transaction object
       Transaction transaction = new Transaction(123456, "John Doe");
      
       //Add line items
       transaction.addLineItem("Colgate Toothpaste", 2, 2.99);
       transaction.addLineItem("Bounty Paper Towels", 1, 1.49);
       transaction.addLineItem("Kleenex Tissue ", 1, 2.49);
      
       //Print transaction description using toString() method
       System.out.println(transaction.toString());
      
       //Update line item
       transaction.updateItem("Colgate Toothpaste", 3, 22.50);
      
       System.out.println("\n-------- Updated Transction details ---------");
       System.out.println(transaction.toString());

   }

}