Question

The Secondhand Rose Resale Shop is having a seven-day sale during which the price of any unsold item drops 10 percent each day. Design an Inventory class that contains an item number and the original price of the item. A default constructor that initializes each attribute to some reasonable default value for a non-existent inventory item. Another constructor that has a parameter for each data member. This constructor initializes each attribute to the value provided when an object of this type is instantiated. Accessor and mutator methods for each attribute. Be sure to incorporate adequate error checking for all numeric attributes. Design an application program that contains a getInput() and a printSaleData() function. The user should enter the item number and the original price of the item. This should continue until the user indicates that they have no more items to enter. For each item entered by the user, an object of Inventory class is created and then is sent to the printSaleData() function for processing. The printSaleData() must accept an Inventory object and produce a report that shows the item number and the price of an inventory item on each day of the sale, one through seven, using a loop. For example, an item with an original price of $10.00 costs 10 percent less, or $9.00, on the first day of the sale. On the second day of the sale, the same item is 10 percent less than $9.00, or $8.10.

Answer 1

import java.util.Scanner; //for Scanner class to read input
class Inventory{ //Inventory class definition
   //attributes declaration
   private int item_number;
   private double item_price;
   //default constructor
   public Inventory(){
       item_number = 1;
       item_price = 10;
   }
   //parameterized constructor
   public Inventory(int number,double price){
       item_number = number;
       item_price = price;
   }
   //mutators
   public void setItemNumber(int number){
       item_number = number;
   }
   public void setItemPrice(double price){
       item_price = price;
   }
   //accessors
   public int getItemNumber(){
       return item_number;
   }
   public double getItemPrice(){
       return item_price;
   }
}

//driver class named Test
class Test{
   static Scanner keyboard; //reference variable of Scanner class
   //getInput method reads item number and price then returns Inverntory object
   public static Inventory getInput(){
       int number;
       double price;
       System.out.print("Enter Item number: ");
       number = keyboard.nextInt();
       System.out.print("Enter Item price: ");
       price = keyboard.nextDouble();
       return new Inventory(number, price);
   }
   //printSalesData method takes Inventory object and prints the prices day-by-day
   public static void printSaleData(Inventory inv){
       System.out.println("\nItem Number: "+inv.getItemNumber());
       double price = inv.getItemPrice();
       System.out.println("Original Price: "+price);
      
       for(int i=1;i<=7;i++){
           price = price - 0.1*price;
           System.out.printf("Day%d: %.2f\n",i,price);
       }
       System.out.print("\n");
   }
   //main method
   public static void main(String[] args) {
       keyboard = new Scanner(System.in); //creates object for Scanner class
       Inventory inventory[] = new Inventory[100]; //creates Inventory array of size 100
       int len = 0;
       char choice; //to store user choice
       while(true){ //loop executes until user enters other than y
           System.out.print("Do you want to enter another item(y/n): ");
           choice = keyboard.next().charAt(0);
           if(choice!='y')
               break;
           inventory[len++] = getInput(); //calls getInput method
       }
       for(int i=0;i<len;i++){ //loops through inventory array and calls printSalesData method
           printSaleData(inventory[i]);
       }
   }
}

//output screenshot

//any query, post in the comment section