I have this code, I have some issue to fix:

1- I need the code to allow me to write in the products.txt file

2-The program is duplicating whatever is writing on products.txt in products_output.txt and I just need it one time

3-From this code I would like to add a sort method that tells me with product is most expensive and cheaper.

 

 

//FileExercise.java
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;
public class FileExercise
{
    public static void main(String[] args)
    {
        String filename="products.txt";
        String out_filename="products_output.txt";
        Scanner filereader =null;
        PrintWriter writer=null;
        String productName="";
        String pricestr="";
        /*try-catch block*/
        try
        {
            //Open file for reading
            filereader =new Scanner(new File(filename));
            //Open file for writing
            writer =new PrintWriter(new File(out_filename));
            while(filereader.hasNextLine())
            {
                /*Split the data by = sing*/
                String data[]=filereader.nextLine().trim().split("=");
                //Get data for name of the product
                productName=data[0];
                //Get data for price of the product
                pricestr=data[0];
                writer.printf("%s %s\r\n", productName,pricestr);
            }
            /*close objects of the Scanner and Writer class*/
            filereader.close();
            writer.close();
            System.out.println("Data write to "+out_filename+" file successully.");
        }
        catch(FileNotFoundException exp)
        {
            System.out.println(exp.getMessage());
        }
        catch(Exception exp)
        {
            System.out.println(exp.getMessage());
        }
        System.out.println("Closing the program.");
    }

}