File IO (PrintWriter and Methods)

[rgru25]

Taking a Java Class, and having a hard time completing this assignment and need help. The program is suppose to read a file, compute the numbers from the the .txt file, create an output file and print the numbers onto the output file with the calculations using the numbers from the original file. We have not yet come to the arrays chapter in the book. Any and all help will be appreciated.

PS The professor provided a template for us to get started, I will post the template, the code I already have, and the input file as an attachment.

import java.util.Scanner;
import java.io.*;
import java.text.*;


public class FileIO
{
public static void main(String[] args)throws IOException
{
String name;
double totalHours = 0;
double totalGrand;

Scanner dataIn;
Scanner kb = new Scanner(System.in);
File myFile = new File("/FileIO_Input.txt");
Scanner inputFile = new Scanner(myFile);

printHeading();

System.out.print("\n");

while(inputFile.hasNext())
{
int hours = inputFile.nextInt();
double rate = inputFile.nextDouble();
name = inputFile.next();
System.out.print(name + "\t\t" + hours + "\t" + rate);
System.out.print("\t");
calculatePay(rate, hours);
}

System.out.print("TOTALS");
}

public static void printHeading()
{
System.out.print("NAME\t\t");
System.out.print("HOURS\t");
System.out.print("RATE\t");
System.out.print("TOTAL\t");
}

public static void calculatePay(double rate, int hours)
{
double totalPay;
totalPay = hours * rate;
System.out.println(totalPay);
}

public static void writeOut(PrintWriter outFile, String name, int hours, double rate) throws IOException
{



}
}

[angstrem]

int hours = inputFile.nextInt();
double rate = inputFile.nextDouble();

Aren't that numbers you need to compute? Just initialize another variable where you'll store the result of computations and, well, change it somehow in the while loop.
By the way, where particularly do you have problems?

[rgru25]

Total hours needs to be calculated, and there also needs to be a grand total calculated. Not to mention an output file needs to be created with the new information. name, hours, rate, totalHours, and grandTotal written to it.

[angstrem]

Tell exactly the formulas you need to apply and the format of the output.

[rgru25]

There aren't any more formulas other than adding all of the hours and totals together. I guess that would be...
hours += totalHours; and formatting I can figure out myself. I just need help on creating an output file and writing to it using the methods.

[Junky]

I'm stunned that you are doing file IO before arrays.

Find yourself a good tutorial that has some code examples. Before attempting to complete your assignment make a simple program that writes some output to a file. Test it thoroughly and if you have problems post your code here. When you have it sorted you can then modify it to your needs.

[rgru25]

I'm having a hard/impossible time bringing the writeOut() method up into the main method. It keeps on saying that my PrintWriter variable hasn't been initalized, and I'm not sure what to = it to.

[Ronin]

Hi rgru25,

You have not declared a PrintWriter variable ouside of the writeOut() method. Once declared then you can initialize it.

Are you currently calling the writeOut() method? If so, how? Answers to these questions would allow us to better resolve your issue.

Regards.

[tamilarasi]

I think you need the output in file format.

you refer this link:
How to write to file in Java – FileOutputStream