I need to create a program to print a supermarket receipt on Java. The program w

Question

I need to create a program to print a supermarket receipt on Java. The program will read a text file containing first a number (integer) which denotes how many items there are in the file, then the items. The formatting is, first the number, then irregardless of how many products there will be a product name, price, then quantity, example as following:

2 //the number of items in the file

Eggs //product name

2.99 //price

2 //quantity or amount

Milk

3.99

1

Now, I know how to read the file and how to do the calculations and print the items, I just need to find a way to store all items in an array since they're different data types.

Then I will need to create a loop to print the item name, price, and quantity while storing the price of each item times the quantity in a subtotal variable. I also need to validate if each attribute (name, price, or quantity) are the correct data type.

Explanation / Answer

use array of objects

import java.util.*;

class Product
{
private String name;
private double price;
private int quantity;
  
public Product(String name,double price,int quantity)
{
this.name = name;
this.price = price;
this.quantity = quantity;
}
public String toString()
{
return " Product Name : "+name + " Price : "+price+" Quantity : "+quantity;
}
  
  
}

class TestProduct
{
public static void main (String[] args)
{
Product[] mylist = new Product[10]; //array of objects,read number of products from first line of file

String name;
double price;
int quantity,n;
  
int i=0;
  
  
//read data from file and put in variables to create array of objects of class Product
Scanner fileInput = new Scanner(new File("product.txt"));
while (fileInput.hasNext())
{
name = fileInput.nextLine();
price = fileInput.nextDouble();
quantity = fileInput.nextInt();

mylist[i] = new Product(name,price,quantity);
i++;
  
}
  
  
n = 0;
  
for(i=0;i<n;i++)
{
System.out.println(mylist[i]);
}
  
  
  
  
}
}

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