Why is my file being cleared if I don't save it?
- by Kat
My program is suppose to maintain a collection of Photos in a PhotoAlbum. It begins by reading a folder of photos and adds them to my PhotoAlbum. It then prints a menu that allows the user to list all the photos, add a photo, find a photo, save, and quit the program. Right now if I run my program it will add the 100 photos to the PhotoAlbum, but if I quit the program without saving, it clears the file I am reading from even if I haven't added a photo or done anything to the PhotoAlbum and I'm not sure why.
Here is my method for printing to a file:
private static void saveFile(PrintWriter writer) {
String result;
ArrayList<Photo> temp = album.getPhotoAlbum();
for (int i = 0; i < temp.size(); i++){
result = temp.get(i).toString() + "\n";
writer.println(result);
}
writer.close();
}
And where the PrintWriter is instantiated:
File file = new File(args[0] + File.separator + "album.dat");
try {
PrintWriter fout =
new PrintWriter(new FileWriter(file));
fileWriter = fout;
} catch (IOException e){
System.out.println("ReadFromFile: Folder " + args[0]
+ " is not found.");
System.exit(0);
}
And where it is called in my runMenu Method:
private static void runMainMenu(Scanner scan) {
String input;
do {
showMainMenu();
input = scan.nextLine().toLowerCase();
switch (input.charAt(0)) {
case 'p':
System.out.println(album.toString());
break;
case 'a':
album.addPhoto(readPhoto(scan, t));
break;
case 'f':
findMenu(scan);
break;
case 's':
saveFile(fileWriter);
System.exit(0);
break;
case 'q':
break;
default:
System.out.println("Invalid entry: " +
input.charAt(0));
break;
}
} while (!input.equalsIgnoreCase("q"));
}
