Question

Hello, I'm having some issues with my code and would appreciate any help

This is the code I'm working with:

https://pastebin.com/0QVP91yt

This is the error I'm getting.

I need to add the total interest of the loans after listing all of them, instead of listening the interest after each loan. I also need to move the "Done reading file" output after listing the loans instead of before.

Answer 1

If you have any doubts, please give me comment...

import java.util.*;

import java.io.*;

// Defines driver class CalcInterestProfits

public class CalcInterestProfits {

// Declares an array of object of the class ModLoan

ModLoan mLoan[];

// Method to read file and stores the data in mLoan array of object

int readFile(String filename) {

// Local variable to store the data read from file

int loanNumber;

double loanAmount;

double annualInterestRate;

int loanTerm;

// Counter for number of records

int counter = 0;

// Scanner class object declared to read file contents

Scanner fileRead = null;

// try block begins

try {

// Opens the file for reading

fileRead = new Scanner(new File(filename));

// Loops till end of the file to count number of records

while (fileRead.hasNext()) {

// Reads a record

fileRead.nextLine();

// Increase the record counter by one

counter++;

} // End of while loop

// Close the file

fileRead.close();

// Allocates memory to array of size counter

mLoan = new ModLoan[counter];

// Re initializes counter to 0

counter = 0;

// Re - opens the file for reading

fileRead = new Scanner(new File(filename));

// Loops till end of the file

while (fileRead.hasNext()) {

// Reads the loan number from the file

loanNumber = fileRead.nextInt();

// Reads the loan amount from the file

loanAmount = fileRead.nextDouble();

// Reads the annual interest rate from the file

annualInterestRate = fileRead.nextDouble();

// Reads the loan term from the file

loanTerm = fileRead.nextInt();

// Creates the object using parameterized constructor and adds it to

// counter index position of mLoan array of object

mLoan[counter] = (new ModLoan(loanNumber, loanAmount, annualInterestRate, loanTerm));

// Increase the record counter by one

counter++;

} // End of while loop

// Close the file

fileRead.close();

} // End of try

// Catch block to handle FileNotFoundException

catch (FileNotFoundException e) {

e.printStackTrace();

System.err.println("Unable to open the file" + filename + "\n Program exiting.");

System.exit(1);

} // End of catch

return counter;

} // End of method

// main method definition

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

// Creates an object of class CalcInterestProfits

CalcInterestProfits cip = new CalcInterestProfits();

// Stores the file name to write

final String LOG_FILENAME = "log.txt";

// Scanner class object created to accept data from user

Scanner keyboard = new Scanner(System.in);

// To store the file name to read from file

String filename;

// Initializes File object to null

File inFile = null;

// Initializes Scanner object for file to null

Scanner fileReader = null;

// PrintStream class object declared to write data to file

PrintStream ps = null;

// Accepts the file name from the user

System.out.println("Enter input data filename:");

filename = keyboard.next();

// Calls the method to read file contents and store it in array of objects

// Stores return value from the method as number of records

int len = cip.readFile(filename);

// Creates two double array to store monthly payment and total interest

double MonthlyPayment[] = new double[len];

double totalInterest[] = new double[len];

double totInterest = 0.0;

// Loops till number of records

for (int x = 0; x < len; x++) {

// Calls the method to display each record data

cip.mLoan[x].displayLoanTerms();

// Calls the method to calculate each record monthly payment

MonthlyPayment[x] = cip.mLoan[x].computeMonthlyPayment();

// Calls the method to calculate each record total interest

totalInterest[x] = cip.mLoan[x].computeTotalInterest(MonthlyPayment[x]);

totInterest += totalInterest[x];

} // End of for loop

// Displays number of records read from file

System.out.println("Done reading file " + filename + " -- " + len + " lines of data read");

// Displays total interest for each record

System.out.println("Total interest to be collected on all loans: $" + totInterest);

// try block begins

try {

// Opens the file for writing

ps = new PrintStream(new File(LOG_FILENAME));

// Loops till number of records

for (int x = 0; x < len; x++)

// Writes the total interest with message to file

ps.println(totalInterest[x] + " interest will be collected on loan number "

+ cip.mLoan[x].getLoanNumber());

} // End of try block

// Catch block to handle FileNotFoundException

catch (Exception e) {

e.printStackTrace();

System.err.println("Unable to open the file for writing");

} // End of catch

} // End of main method

} // End of class