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How to read text file using scanner


By : Pooriya
Date : July 31 2020, 07:00 AM
wish of those help Im trying to read text from a file and compare it to user input. But when I run it I can get an error that reads. I don't know what's wrong any help will be appreciated! , You are closing it:
code :
sc.close();
   if(userName.equals(uName) && passWord.equals(pWord)) 
      {
          System.out.println("Welcome " + userName + "!");
          System.out.println("Menu: ");
          System.out.println("\t1) Account");
          System.out.println("\t2) Payroll");
          System.out.println("\t3) Attendance Report");
          System.out.println("\t4) Service Desk");
          int answer = sc.nextInt(); //here



           switch (answer)  {

              case 1:
                  System.out.print("Welcome to Account!");
                  break;
              case 2:
                  System.out.print("Welcome to Payroll!");
                  break;
              case 3:
                  System.out.print("Welcome to Attendance Report!");
                  break;
              case 4:
                  System.out.print("Welcome to Service Desk!");
                  break;
              default:
                  System.out.print("Enter correct menu option");
       }
   }

        else 
      {
          System.out.println("Sorry, you entered invalid credentials. Try again. ");
     }


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Scanner unable to read text file


By : Nick Balak
Date : March 29 2020, 07:55 AM
will be helpful for those in need The Scanner type is weirdly inconsistent when it comes to handling input. It swallows I/O exceptions - consumers should test for these explicitly - so it is lax in informing readers of errors. But the type is strict when decoding character data - incorrectly encoded text or use of the wrong encoding will cause an IOException to be raised, which the type promptly swallows.
This code reads all lines in a text file with error checking:
code :
  public static List<String> readAllLines(File file, Charset encoding)
      throws IOException {
    List<String> lines = new ArrayList<>();
    try (Scanner scanner = new Scanner(file, encoding.name())) {
      while (scanner.hasNextLine()) {
        lines.add(scanner.nextLine());
      }
      if (scanner.ioException() != null) {
        throw scanner.ioException();
      }
    }
    return lines;
  }
  public static List<String> readAllLinesSloppy(File file, Charset encoding)
      throws IOException {
    List<String> lines = new ArrayList<>();
    try (InputStream in = new FileInputStream(file);
        Reader reader = new InputStreamReader(in, encoding);
        Scanner scanner = new Scanner(reader)) {
      while (scanner.hasNextLine()) {
        lines.add(scanner.nextLine());
      }
      if (scanner.ioException() != null) {
        throw scanner.ioException();
      }
    }
    return lines;
  }

Getting scanner to read text file


By : Peter Marczis
Date : March 29 2020, 07:55 AM
it fixes the issue I am trying to use a scanner to read a text file pulled with JFileChooser. The wordCount is working correctly, so I know it is reading. However, I cannot get it to search for instances of the user inputted word. , You'll have to look for
, ; . ! ? etc.
code :
//this will remove a certain character with a blank space
word = word.replaceAll(".","");
word = word.replaceAll(",","");
word = word.replaceAll("!","");
//etc.
//NOTE:  This example will not work for you.  It's just a simple example for seeing a Regex.
//Removes whitespace between a word character and . or ,
String pattern = "(\\w)(\\s+)([\\.,])";
word = word.replaceAll(pattern, "$1$3"); 

Using Scanner to read from text file


By : user3459825
Date : March 29 2020, 07:55 AM
hope this fix your issue You fire nextLine more than once. You should store nextLine() in a variable at the start of your while() structure and use that.
If you are, by example, at line 10 you will try to read line 10 and line 11.

How To Read A Text File Via Scanner


By : UserXYZ
Date : March 29 2020, 07:55 AM
seems to work fine I guess your problem is that you are trying to read a file that you are currently using, try close the fout object before read it, something like this:
code :
public static void main(String[] args){
    File file = new File("ToDoItems.txt");
    ToDoItem td = new ToDoItem();
    ToDoList tl = new ToDoList();

    Scanner keyboard = new Scanner(System.in);

    ArrayList<String> list = new ArrayList<>();
    String inputline;

    System.out.println("Welcome to the list maker!" + "\n" + "Please start typing.");
    try (PrintWriter fout = new PrintWriter(file)) {
    //                                       ^^ here
        do {
            System.out.println("add to the list? [y/n]");
            inputline = keyboard.nextLine();

            if ("y".equals(inputline)) {
                fout.print(td.getDescription() + System.lineSeparator());
            } else {
                // Important line is here!
                fout.close(); // <--- Close printwriter before read file

                System.out.println("Here is the list so far:");
                Scanner ReadFile = new Scanner(file);

                while (ReadFile.hasNext()) {
                    String listString = ReadFile.nextLine();
                    list.add(listString);
                }
            }
        } while ("y".equals(inputline));
    } catch (FileNotFoundException e) {
        System.err.println(e.getMessage());
    }
    System.out.println(list);
}

Using Scanner to read in a text file


By : G. Cosnett
Date : March 29 2020, 07:55 AM
I hope this helps you . I honestly have no idea what you're trying to do here. You'd better scan it once:
code :
    File comms = new File("src/Resources/com.txt");
    try(Scanner scan = new Scanner(comms)) {
        while(scan.hasNext()) {
            String line = scan.nextLine();

            String[] words = line.split(" ");

            System.out.println(words[0]); // "Hi"
            System.out.println(words[1]); // "0x01"
        }
    }
    catch(Exception e) {

    }
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