Modify the SalesReport2.java program to use the BadData.txt file. You will input integers from this file and continue on if there is a bad record. If a record is bad (nonnumeric), display the file name. Do not just put the filename in quotes, display what file the program used. Change what displays in the catch statements. Add a finally clause. Do something in this clause. See when it is run. Remember: in Eclipse a file must be added to the project, not the src folder. Naming: Name the Java project: LastFProjectAssign09 Name the driver program (main): LastFAssign09.java Where Last is your last name and F is the first initial of your first name. Ex: OgleD Save in a file folder on your storage device SALESREPORT2.JAVA PROGRAM BELOW import java.io.*; // For File class and FileNotFoundException import java.util.*; // For Scanner and InputMismatchException /** * This program demonstrates how exception handlers can * be used to recover from errors. */ public class SalesReport2 { public static void main(String[] args) { String filename = "SalesData.txt"; // File name int months = 0; // Month counter double oneMonth; // One month's sales double totalSales = 0.0; // Total sales double averageSales; // Average sales // Attempt to open the file by calling the // openfile method. Scanner inputFile = openFile(filename); // If the openFile method returned null, then // the file was not found. Get a new file name. while (inputFile == null) { Scanner keyboard = new Scanner(System.in); System.out.print("ERROR: " + filename + " does not exist.\n" + "Enter another file name: "); filename = keyboard.nextLine(); inputFile = openFile(filename); } // Process the contents of the file. while (inputFile.hasNext()) { try { // Get a month's sales amount. oneMonth = inputFile.nextDouble(); // Accumulate the amount. totalSales += oneMonth; // Increment the month counter. months++; } catch(InputMismatchException e) { // Display an error message. // Nonnumeric data was encountered. System.out.println("Nonnumeric data " + "encountered in the file: " + e.getMessage()); System.out.println("The invalid record " + "will be skipped."); // Skip past the invalid data. inputFile.nextLine(); } } // Close the file. inputFile.close(); // Calculate the average. averageSales = totalSales / months; // Display the results. System.out.printf("Number of months: %s\n", months); System.out.printf("Total Sales: $%,.2f\n", totalSales); System.out.printf("Average Sales: $%,.2f\n", averageSales); } /** * The openFile method opens the file with the name specified * by the argument. A reference to a Scanner object is * returned. */ public static Scanner openFile(String filename) { Scanner scan; // Attempt to open the file. try { File file = new File(filename); scan = new Scanner(file); } catch(FileNotFoundException e) { scan = null; } return scan; } } (((((**BADDATA.TXT BELOW**))))) 100 200 300 Bad Data 400 500 Bad Data 600
Modify the SalesReport2.java
- You will input integers from this file and continue on if there is a bad record.
- If a record is bad (nonnumeric), display the file name. Do not just put the filename in quotes, display what file the program used.
- Change what displays in the catch statements.
- Add a finally clause. Do something in this clause. See when it is run.
Remember: in Eclipse a file must be added to the project, not the src folder.
Naming:
- Name the Java project: LastFProjectAssign09
- Name the driver program (main): LastFAssign09.java
- Where Last is your last name and F is the first initial of your first name. Ex: OgleD
- Save in a file folder on your storage device
SALESREPORT2.JAVA PROGRAM BELOW
import java.io.*; // For File class and FileNotFoundException
import java.util.*; // For Scanner and InputMismatchException
/** * This program demonstrates how exception handlers can
* be used to recover from errors.
*/
public class SalesReport2
{
public static void main(String[] args)
{
String filename = "SalesData.txt"; // File name
int months = 0; // Month counter
double oneMonth; // One month's sales
double totalSales = 0.0; // Total sales
double averageSales; // Average sales
// Attempt to open the file by calling the
// openfile method.
Scanner inputFile = openFile(filename);
// If the openFile method returned null, then
// the file was not found. Get a new file name.
while (inputFile == null)
{
Scanner keyboard = new Scanner(System.in);
System.out.print("ERROR: " + filename +
" does not exist.\n" +
"Enter another file name: ");
filename = keyboard.nextLine();
inputFile = openFile(filename);
}
// Process the contents of the file.
while (inputFile.hasNext())
{
try
{
// Get a month's sales amount.
oneMonth = inputFile.nextDouble();
// Accumulate the amount.
totalSales += oneMonth;
// Increment the month counter.
months++;
}
catch(InputMismatchException e)
{
// Display an error message.
// Nonnumeric data was encountered.
System.out.println("Nonnumeric data " +
"encountered in the file: " +
e.getMessage());
System.out.println("The invalid record " +
"will be skipped.");
// Skip past the invalid data.
inputFile.nextLine();
}
}
// Close the file.
inputFile.close();
// Calculate the average.
averageSales = totalSales / months;
// Display the results.
System.out.printf("Number of months: %s\n", months);
System.out.printf("Total Sales: $%,.2f\n", totalSales);
System.out.printf("Average Sales: $%,.2f\n", averageSales);
}
/**
* The openFile method opens the file with the name specified
* by the argument. A reference to a Scanner object is
* returned.
*/
public static Scanner openFile(String filename)
{
Scanner scan; // Attempt to open the file.
try
{
File file = new File(filename);
scan = new Scanner(file);
}
catch(FileNotFoundException e)
{
scan = null;
}
return scan;
}
}
(((((**BADDATA.TXT BELOW**)))))
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Bad Data
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Bad Data
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