静态方法在Main中运行，但不在Main内部while循环中运行

Question

我正在开发一个Java Menu驱动的程序，该程序使用多个静态方法和在Main中运行的菜单程序。除第一个菜单选项外，所有菜单选项都运行良

第一个菜单项PopulateTables（）在while循环之外运行正常，如下例所示：

public class Menu {

static Connection con = JDBCConnection.connect();
static Scanner scan = new Scanner(System.in);

public static void main(String[] args) {
    int answer = 0;
    PopulateTables();

    /*while (answer != 6) {
        Menu();

        System.out.println("Which would you like to do?");
        answer = scan.nextInt();
        scan.nextLine();

        if (answer == 1) {

            PopulateTables();
        }

        if (answer == 2) {
            TeamsWins();
        }

        if (answer == 3) {
            NumberTeamWins();
        }

        if (answer == 4) {
            YearWorldSeries();
        }

        if (answer == 5) {
            //AddNewYear();
        }

        if (answer == 6) {
            System.out.println("See you later!");
            System.exit(0);
        }

    }*/
}

这是静态方法：

public static void PopulateTables() {

    List<Team> team = new ArrayList<>();
    List<Game> game = new ArrayList<>();

    Frame f = new Frame();

    FileDialog foBox = new FileDialog(f, "Reading text file", FileDialog.LOAD);
    foBox.setVisible(true);

    String foName = foBox.getFile();
    String dirPath = foBox.getDirectory();

    // create a file instance for the absolute path
    File inFile = new File(dirPath + foName);
    BufferedReader in = null;
    try {
        // create a BufferedReader to use to read in the file
        in = new BufferedReader(new FileReader(inFile));

        // read in the first entire line from the file
        String line = in.readLine();
        int year = 1903;
        int teamID = 1;

        // continue until the line is null (ie you are at the end of the file)
        while (line != null) {
            StringTokenizer t = new StringTokenizer(line, ",");

            String teamOneName = t.nextToken().trim();
            String teamOneLeague = t.nextToken().trim();
            String teamTwoName = t.nextToken().trim();
            String teamTwoLeague = null;
            if (teamOneLeague.equalsIgnoreCase("AL")) {
                teamTwoLeague = "NL";
            } else {
                teamTwoLeague = "AL";
            }

            Team firstTeam = new Team(teamOneName, teamOneLeague);
            Team secondTeam = new Team(teamTwoName, teamTwoLeague);

            boolean firstTrue = false;
            boolean secondTrue = false;

            for (int i = 0; i < team.size(); i++) {
                if (firstTeam.getTeamName().equalsIgnoreCase(team.get(i).getTeamName())) {
                    firstTrue = true;
                }
            }
            if (firstTrue == false) {
                firstTeam.setTeamID(teamID);
                team.add(firstTeam);
                teamID++;
            } else {
                for (int i = 0; i < team.size(); i++) {
                    if (team.get(i).getTeamName().equals(teamOneName)) {
                        firstTeam.setTeamID(team.get(i).getTeamID());
                    }
                }
            }
            for (int i = 0; i < team.size(); i++) {
                if (secondTeam.getTeamName().equalsIgnoreCase(team.get(i).getTeamName())) {
                    secondTrue = true;
                }

            }
            if (secondTrue == false) {
                secondTeam.setTeamID(teamID);
                team.add(secondTeam);
                teamID++;
            } else {
                for (int i = 0; i < team.size(); i++) {
                    if (team.get(i).getTeamName().equals(teamTwoName)) {
                        secondTeam.setTeamID(team.get(i).getTeamID());
                    }
                }
            }

            Game newGame = new Game(year, firstTeam, secondTeam);
            game.add(newGame);
            if (year == 1903 || year == 1993) {
                year = year + 2;
            } else {
                year++;
            }

            // read in the next line
            line = in.readLine();
        }
    } // catch any IOException that occurs
    catch (IOException io) {
        System.out.println("An IO Exception occurred");
        io.printStackTrace();
    } finally // finally always runs no matter what so close the file here!
    {
        // close the file. Java is neurotic - it worried "but what if it is already closed?" so needs another try/catch 
        try {
            in.close();
        } catch (Exception e) {
        }   // note the {} - means "do nothing".  I wanted it closed anyway.
    }

    Statement stmt = null;

    try {
        for (int i = 0; i < team.size(); i++) {

            Team teamInserted = team.get(i);
            String teamName = teamInserted.getTeamName();
            String league = teamInserted.getLeague();
            String teamID = Integer.toString(teamInserted.getTeamID());

            stmt = con.createStatement();

            stmt.executeUpdate("insert into team "
                    + "values(" + teamID + ", '" + teamName + "', '" + league + "')");

        }
    } catch (SQLException e) {
        e.printStackTrace();
        System.out.println("SQL Exception");
    }

    try {
        for (int i = 0; i < game.size(); i++) {

            Game gameInserted = game.get(i);
            String gameYear = Integer.toString(gameInserted.getYearGame());
            String winID = Integer.toString(gameInserted.getWinTeam().getTeamID());
            String lossID = Integer.toString(gameInserted.getLossTeam().getTeamID());

            stmt = con.createStatement();

            stmt.executeUpdate("insert into game "
                    + "values(" + gameYear + ", " + winID + ", " + lossID + ")");

        }
    } catch (SQLException e) {
        e.printStackTrace();
        System.out.println("SQL Exception");
    }
    finally{
        System.exit(0);
    }

如果我改变Main以便PopulateTables（）方法在循环中的菜单内部，它看起来像进入无限循环或者只是不运行。正如您所看到的，这是练习，我是Java的相对新手。感谢。