List 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.Collections;
import java.util.Comparator;
import java.util.Scanner;


public class Problem9_ListOfProducts {

    public static class PriceSorter implements Comparator<Product>{ // class for sorting "product" objects by price

        public int compare(Product one, Product another){  // the method
            int returnVal = 0;

            if(one.getPrice().compareTo(another.getPrice())<0){
                returnVal =  -1;
            }else if(one.getPrice().compareTo(another.getPrice())>0){
                returnVal =  1;
            }else if(one.getPrice() == another.getPrice()){
                returnVal =  0;
            }
            return returnVal;
            }
        }

    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 {
        try {
            Scanner scanner = new Scanner(new File("Input.txt")); //opening the input file
            ArrayList<Product> products = new ArrayList<Product>(); //list to keep the products from input file

            while (scanner.hasNextLine()){ //checking if the file has more lines
                Product temp = new Product(scanner.next(),scanner.nextBigDecimal()); //creating temporary product
                products.add(temp); //adding the temporary product to the list
            }

            PrintWriter writer = new PrintWriter("Output.txt", "UTF-8"); //writing the output file
            Collections.sort(products,new PriceSorter()); //using PriceSorter class to sort the list of products by price

            for (Product prod:products){   // iterate through each product from the list (now sorted)
                writer.printf("%s %s",prod.price,prod.name); //print the product values
                writer.println(); //add a new line
            }
            writer.close(); //closing the file

        } catch (FileNotFoundException e) { //catching the exception if the file does not exist
            System.out.println("Error: file not found!"); //printing error message
            System.exit(1); //program exit
        }
    }
}