A store owner keeps a record of daily transactions in a text file. Each line contains three items: The invoice number, the cash amount, and the letter P if the amount was paid or R if the amount was received. Items on each line are separated by spaces. Wri te a program that prompts the store owner for the amount of cash at the beginning of the day and for the amount of cash at the end of the day, as well as the name of the ledger text file. Your program should calculate if the actual amount of cash at the en d of the day equals the expected value. If an error is found while reading the text file, the user should be allowed to choose another file

Answer explained below

Explanation:

Java Program:

package ledger;

import java.util.*;

import java.io.*;

public class Ledger {

   //Main method

   public static void main(String[] args) throws FileNotFoundException {

       String fileName;

       try

       {

           //Reading file name

           fileName = getFileName();

           //Processing file

           processFile(fileName);

       }

       catch(Exception ex)

       {

           //Reading file name

           fileName = getFileName();

           //Processing file

           processFile(fileName);

       }

   }

   //Reading file name

   public static String getFileName()

   {

       String fileName;

       Scanner sc = new Scanner(System.in);

       //Prompting user for file name

       System.out.print("\n\n Enter ledger text file name: ");

       //Reading and storing file name

       fileName = sc.nextLine();

       return fileName;

   }

   //Method that process the file

   public static void processFile(String fileName) throws FileNotFoundException

   {

       //Scanner class object for reading file

       Scanner reader = new Scanner(new File(fileName));

       double startingBalance, endingBalance, amount, balance;

       String transactionType, invoiceNum;

       //Scanner class object

       Scanner sc = new Scanner(System.in);

       //Reading starting balance

       System.out.print("\n Enter Starting Balance: ");

       startingBalance = sc.nextDouble();

       //Reading ending balance

       System.out.print("\n Enter Ending Balance: ");

       endingBalance = sc.nextDouble();

       //Initiall balance is starting balance

       balance = startingBalance;

       //Reading data

       while(reader.hasNext())

       {

           //Reading invoice number

           invoiceNum = reader.next();

           //Reading amount

           amount = reader.nextDouble();

           //Reading transaction type

           transactionType = reader.next();

           //For Paid transactions

           if(transactionType.equalsIgnoreCase("P"))

           {

               balance = balance - amount;

           }

           //For Received transactions

           else

           {

               balance = balance + amount;

           }

       }

       System.out.println("\n\n Ledger Balance: " + balance);

       //Closing file

       reader.close();

       //Comparing ending balance

       if(balance == endingBalance)

       {

           System.out.println("\n Actual amount matches with the expected value \n");

       }

       else

       {

           System.out.println("\n Sorry!!! Actual amount doesn't match with the expected value \n");

       }

   }

}

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