是否可以多次使用文件扫描程序而不声明多个扫描程序？

Question

I'm making a program for my improv theater that will help us pick out games we play in shows on a night without overlapping styles of any other games. I've come into a problem though. In the code below, Scanner scWU reads a .txt file that contains names of improv games, and Scanner sc is a normal System.in scanner.

I've pasted two of my methods below. getWarmUp() returns the string (game) after it's been deemed a doable game of a certain category (in this case, the warmup game category). isWarmUp() reads the warmupgames.txt file and sees if the game entered is indeed a warmup game

My question is: If the user fails to enter the name of the game (and isWarmUp returns false), how can I re-launch the method OR reset the scWU scanner at the top of the file? Would I have to declare multiple scanners? Or could I easily make the same scanner scan the file again after the user fails the first time to enter a game correctly? (NOTE: I am aware the while loop on line 25 is an infinite loop. This is where I'm hoping to address this question)

I will answer any confusion about my code

   public static String getWarmUp(Scanner sc, Scanner scWU)
   {
      String prompt = "What warm-up game will you choose? \n" +
                      "(NOTE: Type game as it's written on the board. Caps and symbols don't matter.)\n" +
                      "> ";

      System.out.print(prompt);
      String game = sc.nextLine();

      //This while loop is infinite. This is where I'm hoping to somehow allow the scanner to reset and
      //read again on a failed input
      while(!warmUp)
      {
         warmUp = isWarmUp(scWU, game);
         if(!warmUp)
            System.out.println("That's not a warm-up game, try again.");
      }

      return game;
   }

   public static boolean isWarmUp(Scanner scWU1, String game)
   {
      int lineNum = 0;

         while(scWU1.hasNextLine())
         {
            String line = scWU1.nextLine();
            lineNum++;
            if(line.equalsIgnoreCase(game))
               return true;
         }

      return false;

Answer 1

Here's what I mean. Presumably you're now using getWarmUp something like this:

String gamesFileName = "theGamesFile.txt");
Scanner in = new Scanner(System.in);
Scanner games = new Scanner(gamesFileName);
getWarmUp(in, games);

But getWarmUp (or, rather, isWarmUp , which getWarmUp calls) might need to re-read the file from the beginning. The only way it can do this is by creating a new Scanner . And you'd need the filename in order to create the new Scanner . So have getWarmUp take the filename as an argument instead of an opened Scanner :

public static String getWarmUp(Scanner sc, String gamesFn)
   {
      boolean warmUp = false;    
      while(!warmUp)
      {
          String prompt = "What warm-up game will you choose? \n" +
                          "(NOTE: Type game as it's written on the board. Caps and symbols don't matter.)\n" +
                      "> ";
          System.out.print(prompt);

          String game = sc.nextLine();

          Scanner scWU = new Scanner(gamesFn);
          warmUp = isWarmUp(scWU, game);
          scWU.close();
          if(!warmUp)
              System.out.println("That's not a warm-up game, try again.");
      }    
      return game;
   }    

Then call it like this:

String gamesFileName = "theGamesFile.txt");
Scanner in = new Scanner(System.in);
getWarmUp(in, gamesFileName);