Как отформатировать данные, напечатанные из файла?

Question

Программа работает, но выдает странный вывод. Я пытаюсь выяснить, как решить эту проблему или в чем проблема. Где я должен перейти к форматированию файла, чтобы у каждого метода была своя строка с объяснением? И, похоже, файл отображается более одного раза. Вот код:

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

public class App {

    public static void main(String[] args) {

        String bridesName = getBridesName();
        String groomsName = getGroomsName();
        int numberOfGuests = getNumberOfGuests();
        double squareFootage = getSquareFootage();
        ArrayList <String> namesOfSongs = getNamesOfSongs();
        int guestsPerSquarefoot = getGuestPerSquarefoot(numberOfGuests, squareFootage);

        try {

            //add all the data to the text file
            FileWriter dataToFile = new FileWriter (new File("wedding.txt"), true);
            dataToFile.write(" Name of the bride: " + bridesName + "\n");
            dataToFile.write(" Name of the groom: " + groomsName + "\n");
            dataToFile.write(" Number of guests: " + numberOfGuests + "\n");
            dataToFile.write(" Square footage of the location: " + (Double.toString(squareFootage) + "\n"));

            //add songs to the text file
            for (String song : namesOfSongs)
            {
            dataToFile.write(song);

            }

            dataToFile.write(" Number of guests per square footage: " + guestsPerSquarefoot + "\n");

            dataToFile.close();



            //diplay data from the text file

            Scanner scan = new Scanner (new File("wedding.txt"));
            while (scan.hasNextLine())
            {
                System.out.println(scan.nextLine());
            }
            scan.close();


        } 

        catch (Exception e) {
            System.out.println("You got an error.");
        }

    }

    Scanner scan = new Scanner(System.in);

    public static String getBridesName(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Please enter the name of the bride: ");
        String brideName = scan.nextLine();
        //scan.close();
        return brideName;
    }

    public static String getGroomsName(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Please enter the name of the groom: ");
        String groomName = scan.nextLine();
        //scan.close();
        return groomName;
    }

    public static Integer getNumberOfGuests(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the total number of guests at the wedding: ");
        int numberOfGuests = scan.nextInt();
        //scan.close();
        return numberOfGuests;
    }

    public static Double getSquareFootage(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the square footage of the location: ");
        double squareFootage = scan.nextDouble();
        //scan.close();
        return squareFootage;
    }

    public static ArrayList <String> getNamesOfSongs(){
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the names of each song in the DJ's playlist: ");
        System.out.println("When finished, enter done.");
        ArrayList <String> NamesOfSongs = new ArrayList<>();
        boolean loop = true;

        while(loop) {
            String input = scan.nextLine();
            if(input.equals("done")) {
                /* Stop the input => stop while loop*/
                loop = false; 
            } else {
                /* add song */
                NamesOfSongs.add(input);
            }
        }
        //scan.close();
    return NamesOfSongs;
    }

    public static int getGuestPerSquarefoot(int numberOfGuests, double squareFootage){
        int GuestsPerSquarefoot = (int)numberOfGuests/(int)squareFootage;
        return GuestsPerSquarefoot;
    }



}

Поэтому вывод программы следующий:

Please enter the name of the bride: 
susan
Please enter the name of the groom: 
mike
Enter the total number of guests at the wedding: 
12
Enter the square footage of the location: 
12
Enter the names of each song in the DJ's playlist: 
When finished, enter done.
kkk
jjj
iii
done
fg23.2ss"222.2 susanmike
                        22.3 susanmike
jjj
iii
done
fg23.2ss"222.2 susanmike                                                        12.5Name of
 the bride: susanName of22.3 susanmikekeNumber of guests: 12Square footage of the location: 12.0kkkjjjiiiNumber of guests per square footag12.4susanmikehe bride: susanName of the groom: mikeNumber of guests: 12Square footage of the location: 12.4kkkjjji12.56susanmikeests per square footage: 1 Name of the bride: susan Name of the groom: mike Number of guests: 12 Squa13.56 susanmikehe location: 24.0kkkjjjiiinnn Number of guests per square footage: 0 Name of the bride: susan        12.5Name of
 the bride: susanName of the groom: mikeNumber of guests: 12Square footage of the location: 12.0kkkjjjiiiNumber of guests per square footage: 1Name of the bride: susanName of the groom: mikeNumber of guests: 12Square footage of the location: 12.4kkkjjjiiiNumber of guests per square footage: 1 Name of the bride: susan Name of the groom: mike Number of guests: 12 Square footage of the location: 24.0kkkjjjiiinnn Number of guests per square footage: 0 Name of the bride: susan
 Name of the groom: mike
 Number of guests: 12
 Square footage of the location: 12.0
kkkjjjiii Number of guests per square footage: 1

Answer 1

Когда вы создали средство записи файлов, вы используете флаг append. При каждом запуске новый контент будет добавляться к существующему.

    /**
     * Constructs a {@code FileWriter} given the {@code File} to write and
     * a boolean indicating whether to append the data written, using the platform's
     * {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
     *
     * @param file  the {@code File} to write
     * @param     append    if {@code true}, then bytes will be written
     *                      to the end of the file rather than the beginning
     * @throws IOException  if the file exists but is a directory rather than
     *                  a regular file, does not exist but cannot be created,
     *                  or cannot be opened for any other reason
     * @since 1.4
     */
public FileWriter(File file, boolean append)

Вы можете убрать флажок, если не хотите старый контент

new FileWriter (new File("wedding.txt"));

Поместить каждую песню в новой строке добавляйте \n после каждой написанной песни

dataToFile.write(song + "\n");

или

dataToFile.write("\t");
dataToFile.write(song);
dataToFile.write("\n");

Выход

 Name of the bride: susan
 Name of the groom: mie
 Number of guests: 12
 Square footage of the location: 12.0
    kkk
    jjj
    iii
 Number of guests per square footage: 1

Answer 2

Это просто отсутствие перевода строки в вашем выводе? Как правило, при печати в удобочитаемом виде вы можете обернуть ваш Writer чем-то вроде PrintWriter и использовать println () или format (). Вот небольшой пример, подобный вашему:

  public static void main(String[] args) throws Exception {
    String bridesName = "susan";
    String groomsName = "mike";
    int numberOfGuests = 12;
    double squareFootage = 12;
    ArrayList<String> namesOfSongs = new ArrayList<>();
    namesOfSongs.add("kkk");
    namesOfSongs.add("lll");
    namesOfSongs.add("iii");
    int guestsPerSquarefoot = 1;

    //add all the data to the text file
    try (PrintWriter dataToFile = new PrintWriter(new FileWriter("wedding.txt", true)))
    {
      dataToFile.println("Name of the bride: " + bridesName);
      dataToFile.println("Name of the groom: " + groomsName);
      dataToFile.println("Number of guests: " + numberOfGuests);
      dataToFile.println("Square footage of the location: " + (Double.toString(squareFootage)));

      //add songs to the text file
      for (String song : namesOfSongs)
      {
        dataToFile.println(song);
      }

      dataToFile.write("Number of guests per square footage: " + guestsPerSquarefoot);

      dataToFile.close();
    }

    try (Scanner scan = new Scanner (new File("wedding.txt"))) {
      while (scan.hasNextLine())
      {
        System.out.println(scan.nextLine());
      }
    }
  }

Вывод:

Name of the bride: susan
Name of the groom: mike
Number of guests: 12
Square footage of the location: 12.0
kkk
lll
iii
Number of guests per square footage: 1