Question

Write the following program in Java using Eclipse.

A cash register is used in retail stores to help clerks enter a number of items and calculate their subtotal and total. It usually prints a receipt with all the items in some format. Design a Receipt class and Item class. In general, one receipt can contain multiple items. Here is what you should have in the Receipt class:

numberOfItems: this variable will keep track of the number of items added to this receipt. This is int value.

items: this is an array of Item class. The size of the array will be set in the constructor.

numberOfSales: this variable should keep track of all the Receipts.

Constructor: this constructor should accept an int value. This value will be used to set the size of the items array.

add(Item): this method accepts an item object and adds it to the items array.

add(name, price, qty, id): this is an overloaded add method. It works the same way as the add method above.

printReceipt(): this method displays a receipt with all the items. Including each item’s name, price, qty and subtotal. In addition, it displays the sales tax collected as well as the total after tax.

You don’t have to create the Item class. Use the attached one. However, you have to add some code to enforce the input validation in the following methods:

setName

setPrice

setQty

Input Validation:

Don't accept any id less than 1000.

Don't accept any negative input for price or qty

Don't accept an empty or null string for the name.

When your program gets an invalid input, it should print an error message and exit.

Here is the Sample Output:

ID Name Price Qty SubTotal 2222 Milk $3.99 4 $15.96 1222 Eggs $2.99 $8.97 1000 0J $5.99 1 $5.99 1223 Butter $1.49 10 $14.9 $3.49 7.625% Sales Tax: $80.76 Total After Tax

Here is the content of the main method, that was used to get the output shown above:

       public static void main(String[] args) {

              int maxNumberOfItems = 4;

//            create an instance of CashRegister class

              Receipt receipt = new Receipt(maxNumberOfItems);

//            create an instance of Item class

              Item item1 = new Item("Milk", 3.99, 4, 2222);

//            create an instance of Item class

              Item item2 = new Item("Eggs", 2.99, 3, 1222);

//            add an item to the cash register

              receipt.add(item1);

//            add an item to the cash register

              receipt.add(item2);

//            add an item to the cash register using the overloaded add method

              receipt.add("OJ", 5.99, 1, 1000);

//            add an item to the cash register using the overloaded add method

              receipt.add("Butter", 1.49, 10, 1223);

             

//            display a receipt with all the items

              receipt.printReceipt();   

       }

First create a project and call it pa3

Add a package; call the package edu.century.pa3

Add the two Receipt and Item classes to edu.century.pa3 package

Answer 1

Item.java

package pa3;

public class Item {

   private int id;
   private String name;
   double price;
   int qty;
  
  
   public Item(){
      
   }
  
   public Item(String name,double price,int qty,int id){
       this.name=name;
       this.id=id;
       this.price=price;
       this.qty=qty;
   }
   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public double getPrice() {
       return price;
   }
   public void setPrice(double price) {
       this.price = price;
   }
   public int getQty() {
       return qty;
   }
   public void setQty(int qty) {
       this.qty = qty;
   }
  
}

Receipt.java

package pa3;

public class Receipt {

   private Item[] items;
   private static int count=0;
   public Receipt(int size){
       items=new Item[size];
   }
  
   public void add(Item item){
      
       //check all the constraint before adding item class object
       if(item.getName()!="" && item.getName()!=null){
           if(item.getId()>=1000){
               if(item.getPrice()>0 && item.getQty()>0){
                   items[count]=item;
                   count++;
               }
           }
       }
      
      
   }
  
   public void add(String name,double price,int qty,int id){
      
       //check all the constraint before adding item class object
       if(name!="" && name!=null){
           if(id>=1000){
               if(price>0 && qty>0){
                   Item I=new Item(name,price,qty,id);
                   items[count]=I;
                   count++;
               }
           }
       }
   }
  
   public void printReceipt(){
       System.out.println("ID\t\tName\t\tPrice\t\tQty\t\tSubTotal");
       System.out.println("-----------------------------------------------------------------------------------");
       double sum=0;
       for(int i=0;i<items.length;i++){
          
           double total=items[i].getPrice()*items[i].getQty();
           sum+=total;
           System.out.println(items[i].getId()+"\t\t"+items[i].getName()+"\t\t$"+items[i].getPrice()+"\t\t"+
           items[i].getQty()+"\t\t$"+total);
       }
      
       System.out.println("-----------------------------------------------------------------------------------");
       System.out.println("-----------------------------------------------------------------------------------");
       double temp=((sum*7.625)/100);
       System.out.println("7.625% Service tax:\t\t\t\t\t\t$"+temp);
      
       sum+=temp;
       System.out.println("Total after tax:\t\t\t\t\t\t$"+sum);
   }
  
   public static void main(String[] args) {
int maxNumberOfItems = 4;
// create an instance of CashRegister class
Receipt receipt = new Receipt(maxNumberOfItems);
// create an instance of Item class
Item item1 = new Item("Milk", 3.99, 4, 2222);
// create an instance of Item class
Item item2 = new Item("Eggs", 2.99, 3, 1222);
// add an item to the cash register
receipt.add(item1);
// add an item to the cash register
receipt.add(item2);
// add an item to the cash register using the overloaded add method
receipt.add("OJ", 5.99, 1, 1000);
// add an item to the cash register using the overloaded add method
receipt.add("Butter", 1.49, 10, 1223);

// display a receipt with all the items
receipt.printReceipt();   
}
}

Output:

Eile Edit ource Refactor Navigate Search Projec Bun Window Help Quick AccessJava EE Java MarkersProperties ServersDato Source ExplorerSnippets Console 3 临 < terminated > Receipt [Java Application] C: Program Filesuavayre1 8.0 121\binyava exe 21 Feb 201 7 10 14:27 p ID Name Price ty SubTotal 1222 1000 1223 Hilk Egga OJ Butter S3.99 $2.99 $5.99 $1.49 $15.96 $8.97 $5.99 $14.9 10 $3.493775 $49.313775 7.625% service tax : Total after tax: Ask me anything ^* gxENG 22:16 21-02-2017