Exemple #1
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  /**
   * Reads an integer from the user via getInt. Continues prompting the user until they enter an
   * integer within the specified range.
   *
   * @param prompt prompt for getInt()
   * @param lower lower bound for input (inclusive)
   * @param upper upper bound for input (inclusive)
   * @return an integer between lower and upper inclusive
   *     <p>NOTE: behavior when lower is larger than upper is undefined, but will probably result in
   *     a non-terminating loop... so don't do that.
   */
  public static int getIntInRange(String prompt, int lower, int upper) {
    int userInput = getInt(prompt);
    Logger.log(
        Loglevel.PEDANTIC,
        "Getting int from user in range " + lower + "-" + upper + " (inclusive)");

    while (userInput < lower || userInput > upper) {
      Logger.log(
          Loglevel.WARNING, "Error, input is not in range " + lower + "-" + upper + " (inclusive)");
      userInput = getInt(prompt);
    }

    return userInput;
  }
Exemple #2
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  /**
   * Read the lines from a file, returning them as a list of Strings, one line per index.
   *
   * @param filepath absolute or relative path to file
   * @return the lines from the file
   */
  public static LinkedList<String> readLines(String filepath) {
    Logger.log(Loglevel.PEDANTIC, "reading lines from file " + filepath);
    LinkedList<String> lines = new LinkedList<String>();
    try {
      Scanner stream = new Scanner(new File(filepath));
      while (stream.hasNextLine()) {
        String next = stream.nextLine();
        Logger.log(Loglevel.OVERKILL, "read line from file: " + next);
        lines.append(next);
      }
    } catch (Exception ex) {
      Logger.log(Loglevel.WARNING, "could not read file, exception: " + ex);
    }

    return lines;
  }
Exemple #3
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  /**
   * Read a string form the user, displaying the prompt first. If a newline is desired after the
   * prompt, it must be included in the prompt string.
   *
   * @param prompt the prompt to display to the user
   * @return the user input as a string
   */
  public static String getString(String prompt) {
    Logger.log(Loglevel.PEDANTIC, "get String from user with prompt " + prompt);
    String userInput;
    Scanner in = new Scanner(System.in);

    System.out.print(prompt);

    try {
      userInput = in.nextLine();
    } catch (InputMismatchException e) {
      Logger.log(Loglevel.WARNING, "input invalid; cannot be cast to String");
      Logger.log(Loglevel.WARNING, "encountered non-fatal exception: " + e);
      in.next(); // get rid of invalid value so we can try again
      userInput = getString(prompt);
    }
    Logger.log(Loglevel.PEDANTIC, "read String from user: " + userInput);
    return userInput;
  }
Exemple #4
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  /**
   * Write lines into a file, given as a LinkedList of Strings, with one String per line.
   *
   * @param lines list of lines to write to the file
   * @param filepath absolute or relative path to the file
   */
  public static void writeLines(LinkedList<String> lines, String filepath) {
    Logger.log(Loglevel.PEDANTIC, "writing lines to file " + filepath);
    try {
      FileOutputStream outStream = new FileOutputStream(filepath);
      BufferedWriter outStreamWriter = new BufferedWriter(new OutputStreamWriter(outStream));

      for (String line : lines) {
        Logger.log(Loglevel.OVERKILL, "writing line: " + line);
        outStreamWriter.write(line + "\n");
      }
      outStreamWriter.close();
      outStream.close();
    } catch (FileNotFoundException ex) {
      Logger.log(Loglevel.WARNING, "encountered exception while " + "writing to file: " + ex);
    } catch (IOException ex) {
      Logger.log(Loglevel.WARNING, "encountered exception while " + "writing to file: " + ex);
    }
  }
Exemple #5
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  /**
   * Identical behavior to getString(String prompt), however, this method will continue prompting
   * the user until they enter a string which matches the given regex, and will not return until the
   * user enters a matching string.
   *
   * @param prompt the prompt to display to the user
   * @param regex the regular expression to match
   * @return {the user input as a string
   */
  public static String getString(String prompt, String regex) {
    Logger.log(Loglevel.PEDANTIC, "get String from user with prompt " + prompt);
    Logger.log(Loglevel.PEDANTIC, "user input will be required to " + "match the regex: " + regex);
    String userInput;
    Scanner in = new Scanner(System.in);

    System.out.print(prompt);

    try {
      userInput = in.nextLine();
    } catch (InputMismatchException e) {
      Logger.log(Loglevel.WARNING, "input invalid; cannot be cast to String");
      Logger.log(Loglevel.WARNING, "encountered non-fatal exception: " + e);
      in.next(); // get rid of invalid value so we can try again
      userInput = getString(prompt);
    }
    if (!userInput.matches(regex)) {
      Logger.log(
          Loglevel.WARNING,
          "invalid input; input was a valid string, but does not meet " + "required input format");
      userInput = getString(prompt, regex);
    }
    Logger.log(Loglevel.PEDANTIC, "read String from user: " + userInput);
    return userInput;
  }
Exemple #6
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 /**
  * Asks the user a yes/no or true/false question. Will accept yes, y, true, or t as positive
  * input, and will accept no, n, f, or false as negative input. Any other input will result in a
  * repetition of the prompt. Use input is case insensitive.
  *
  * @param prompt The prompt to display to the user
  * @return true if positive input, false otherwise
  */
 public static boolean getBoolean(String prompt) {
   String response = getString(prompt);
   if (response.equalsIgnoreCase("yes")
       || response.equalsIgnoreCase("y")
       || response.equalsIgnoreCase("true")
       || response.equalsIgnoreCase("t")) {
     return true;
   } else if (response.equalsIgnoreCase("no")
       || response.equalsIgnoreCase("n")
       || response.equalsIgnoreCase("false")
       || response.equalsIgnoreCase("f")) {
     return false;
   } else {
     Logger.log(Loglevel.WARNING, "invalid input; expected yes or no");
     return getBoolean(prompt);
   }
 }