CIS 260 UseCourse.java

Code

/*
    UseCourse.java
    CIS 260
    David Klick
    2012-01-23

    This program demonstrates how data can be written to a file
    sequentially. It also demonstrates the use of the Formatter
    class to write to a file.
*/

import java.util.*;
import java.io.FileNotFoundException;

public class UseCourse {
    private static Formatter out;

    public static void main(String[] args) {
        openFile("courses.txt");
        addCourses();
        if (out != null) out.close();
    }

    private static void openFile(String filename) {
        try {
            out = new Formatter(filename);
        } catch (SecurityException se) {
            System.err.println("Write access denied.");
            System.exit(1);
        } catch (FileNotFoundException fe) {
            System.err.println("Error creating file.");
            System.exit(2);
        }
    }

    private static void addCourses() {
        String dept, sec, room, name;
        int num;

        Scanner in = new Scanner(System.in);
        while (true) {
            System.out.print("Enter department (QUIT to exit): ");
            dept = in.next();
            if (dept.equalsIgnoreCase("QUIT")) break;
            System.out.print("Enter course number: ");
            num = in.nextInt();
            System.out.print("Enter section: ");
            sec = in.next();
            System.out.print("Enter room number: ");
            in.nextLine();  // skip previous newline
            room = in.nextLine();
            System.out.print("Enter course name: ");
            name = in.nextLine();

            Course c = new Course(dept, num, sec, room, name);
            try {
                out.format("%s|%d|%s|%s|%s\n", c.getDepartment(),
                    c.getCourseNumber(), c.getSection(),
                    c.getRoom(), c.getName());
            } catch (FormatterClosedException e1) {
                System.err.println("Error writing to file.");
                System.exit(3);
            } catch (NoSuchElementException e2) {
                System.err.println("Invalid input - record not written.");
                in.nextLine();
            }
        }
    }
}