Order of Products (Homework)

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Problem10_OrderOfProducts {

    public static class Product { //creating object "Product"
        private String name;  // creating property "name"
        private BigDecimal price; //creating property "price"

        public Product(String name, BigDecimal price){ //constructor with parameters
            this.name=name;
            this.price=price;
        }
        public String getName(){ //method to return the name of the product
            return name;
        }
        public BigDecimal getPrice(){ //method to return the price of the product
            return price;
        }
    }

    public static void main(String[] args) throws UnsupportedEncodingException, FileNotFoundException {
        ArrayList<Product> products = new ArrayList<Product>(); //list to keep the products from input file
        try {
            Scanner productsTXT = new Scanner(new File("Products.txt")); //opening the Products.txt file
            while (productsTXT.hasNextLine()){ //checking if the file has more lines
                Product temp = new Product(productsTXT.next(),productsTXT.nextBigDecimal()); //creating temporary product
                products.add(temp); //adding the temporary product to the list
            }
            productsTXT.close();
        } catch (FileNotFoundException e) { //catching the exception if the file does not exist
            System.out.println("Error: Products.txt not found!"); //printing error message
            System.exit(-1); //program exit
        }
        Map<BigDecimal, String> orders = new HashMap<BigDecimal, String>(); //creating hashmap to hold the orders
        try{
            Scanner orderTXT = new Scanner(new File("Order.txt")); //opening the Order.txt file
            while (orderTXT.hasNextLine()){ //checking if the file has more lines
            orders.put(orderTXT.nextBigDecimal(), orderTXT.next()); // putting the temporary order in the hashmap
            }                                                       // using "quantity" + " " + "product" from Order.txt
            orderTXT.close();
        }
        catch (FileNotFoundException e) { //catching the exception if the file does not exist
            System.out.println("Error: Order.txt not found!"); //printing error message
            System.exit(-1); //program exit
        }
        BigDecimal totalPrice = new BigDecimal("0"); // initialize totalPrice
        for (Map.Entry<BigDecimal, String> entry : orders.entrySet()) { //iterating the orders hashmap
            BigDecimal quantity = entry.getKey(); // getting the quantity
            String key = entry.getValue(); // getting the name
            for (Product product: products){ // iterating and checking the products list for the key
                if (product.getName().equals(key.toString())){ // if the product is found
                    BigDecimal itemCost = product.getPrice().multiply(quantity); // calculate item cost
                    totalPrice = totalPrice.add(itemCost); //adding item cost to the total price
                }
            }
        }
        PrintWriter writer = new PrintWriter("Output.txt", "UTF-8"); //writing the output file
        writer.printf("%.2f",totalPrice); //writing the total price to the output text file
        writer.close(); // closing the writer
        System.out.printf("%.2f",totalPrice); //print totalprice to console
    }
}