如何读取具有多种数据类型的文本文件并将它们存储在数组中？

Question

I am trying to read a text file of various data and getting it stored into an Array, so that after receiving user input I can compare it to see if there are any matches inside the Array.

example text:

1A 1st true false false 28.50 free  
2B 2nd false true false 25.00 free  
3C 3rd true true false 32.50 free

As you can see I'm dealing with Strings, booleans and a double.

I initially tried reading the file and storing each line as a String in a String Array but that didn't work when I then needed to compare the user input.

So I then tried to create an Array and a sub-array like below:

    try {
        File read = new File("seats.txt");
        Scanner reader = new Scanner(read);
        while (reader.hasNextLine()) {
            String dataRead = reader.nextLine();
            
            String[] seatData = dataRead.split(" ");
            
            String seatID = seatData[0];
            String seatClass = seatData[1];
            boolean window = Boolean.parseBoolean(seatData[2]);
            boolean aisle = Boolean.parseBoolean(seatData[3]);
            boolean table = Boolean.parseBoolean(seatData[4]);
            double seatPrice = Double.parseDouble(seatData[5]);
            String seatFree = seatData[6];
            
            Seats info = new Seats(seatID, seatClass, window, aisle, table, seatPrice, seatFree);
            result = info;
            System.out.println(result); }
        
            reader.close();
            
    }catch (FileNotFoundException e) {
        System.out.println("An error has occurred.");
        e.printStackTrace(); }
    return result; 
    
}

Is this the right method or should I look at trying something else?

Any insight or advice would be much appreciated. Thanks.

Answer 1

You reading and parsing is good, but you're not saving anything, you keep overwriting result with the last info , so your method return only one Seats instance, the last one, use a List to easily add all the Seats you create

With some improvements

• try_with-resources for autoclosing the scanner

• one row is one seat, name the class Seat

static List<Seat> read() {
    List<Seat> results = new ArrayList<>();
    File read = new File("seats.txt");
    String dataRead;

    try (BufferedReader reader = new BufferedReader(new FileReader(read))) {
        while ((dataRead = reader.readLine()) != null) {
            String[] seatData = dataRead.split(" ");
            String seatID = seatData[0];
            String seatClass = seatData[1];
            boolean window = Boolean.parseBoolean(seatData[2]);
            boolean aisle = Boolean.parseBoolean(seatData[3]);
            boolean table = Boolean.parseBoolean(seatData[4]);
            double seatPrice = Double.parseDouble(seatData[5]);
            String seatFree = seatData[6];
            Seat info = new Seat(seatID, seatClass, window, aisle, table, seatPrice, seatFree);
            System.out.println(info);
            results.add(info);
        }
    } catch (FileNotFoundException e) {
        System.out.println("An error has occurred.");
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return results;
}

Answer 2

Use Jackson. https://cowtowncoder.medium.com/reading-csv-with-jackson-c4e74a15ddc1 . See second last example.