场景元素在javafx中显示两次？

Question

我正在为我制作的这个小型棋盘游戏应用程序使用javafx构建UI。它只有Othello和Connect Four，您也可以添加球员以保持得分。分数仅记录在.txt文件中，并在程序启动时加载。

主菜单是带有记分板的场景，该记分板是从.txt文件创建的，还包括按钮。我可以添加播放器，然后将它们写入文件并加载就可以了，当我尝试在.txt文件中重新加载播放器并刷新记分板时，就会出现问题。我尝试刷新场景，但记分牌被打印两次。

代码如下：

import java.io.*;
import java.util.*;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.geometry.*;

public class Main extends Application {

    static Stage window;

    public void refreshMainMenu() {

        Button c4button = new Button("Connect Four");
        Button othelloButton = new Button("Othello");
        Button addPlayerButton = new Button("Add New Player");
        Button quitButton = new Button("Quit");

        GridPane scoreboard = new GridPane();
        if(!Player.loadPlayers()) {
            Label label = new Label("No Players Yet");
            scoreboard.add(label, 0, 0);
        }
        else {
            Label label = new Label("Scoreboard:\n");
            Label temp1 = new Label("Name\t");
            Label temp2 = new Label("Othello Wins\t");
            Label temp3 = new Label("Connect Four Wins\t");
            Label temp4 = new Label("Total Wins\t");
            scoreboard.add(label, 0, 0);
            scoreboard.add(temp1, 0, 1);
            scoreboard.add(temp2, 1, 1);
            scoreboard.add(temp3, 2, 1);
            scoreboard.add(temp4, 3, 1);

            for(int i = 0; i < Player.getPlayerList().size(); i++) {
                Label temp5 = new Label(Player.getPlayerList().get(i).getName());
                Label temp6 = new Label(Integer.toString(Player.getPlayerList().get(i).getOthelloWins()));
                Label temp7 = new Label(Integer.toString(Player.getPlayerList().get(i).getConnectFourWins()));
                Label temp8 = new Label(Integer.toString(Player.getPlayerList().get(i).getTotalWins()));

                scoreboard.add(temp5, 0, i+2);
                scoreboard.add(temp6, 1, i+2);
                scoreboard.add(temp7, 2, i+2);
                scoreboard.add(temp8, 3, i+2);
            }
        }
        scoreboard.setAlignment(Pos.CENTER);

        HBox buttons = new HBox(20);
        buttons.getChildren().addAll(c4button, othelloButton, addPlayerButton, quitButton);
        buttons.setAlignment(Pos.CENTER);

        VBox layout = new VBox(10);
        layout.getChildren().addAll(scoreboard, buttons);
        layout.setAlignment(Pos.CENTER);

        Scene mainMenu = new Scene(layout, 600, 300);

        window.setScene(mainMenu);
        window.show();

        c4button.setOnAction(e -> {
            try {
                ConnectFour.playConnectFour();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        });
        othelloButton.setOnAction(e -> {
            try {
                Othello.playOthello();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        });
        addPlayerButton.setOnAction(e -> {
            try {
                String newPlayer = TextBox.display("Add Player", "Enter Player Name:");
                Player.addNewPlayer(newPlayer);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
            refreshMainMenu();
        });
        quitButton.setOnAction(e -> {
            boolean response = ConfirmBox.display("Exit Board Master","Are you sure?");
            if(response)
                window.close();
        });
        window.setOnCloseRequest(e -> {
            e.consume();
            boolean response = ConfirmBox.display("Exit Board Master","Are you sure?");
            if(response)
                window.close();
        });
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        window = primaryStage;
        window.setTitle("Board Master");
        refreshMainMenu();
    }

    public static void main(String[] args) throws IOException {
        launch(args);
    }
}

还有确认和文本框弹出窗口：

import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.scene.layout.*;
import javafx.scene.control.*;

public class ConfirmBox {

    private static boolean response;

    static boolean display(String title, String message) {
        Stage window = new Stage();
        window.setTitle(title);
        window.initModality(Modality.APPLICATION_MODAL);

        Button yesButton = new Button("Yes");
        Button noButton = new Button("No");
        yesButton.setOnAction(e -> {
            response = true;
            window.close();
        });
        noButton.setOnAction(e -> {
            response = false;
            window.close();
        });

        Label label = new Label(message);
        StackPane toplayout = new StackPane(label);

        HBox centerlayout = new HBox(10);
        centerlayout.getChildren().addAll(yesButton, noButton);
        centerlayout.setAlignment(Pos.CENTER);

        BorderPane layout = new BorderPane();
        layout.setPadding(new Insets(5,5,5,5));
        layout.setTop(toplayout);
        layout.setCenter(centerlayout);

        Scene alertBox = new Scene(layout, 250, 60);
        window.setScene(alertBox);
        window.showAndWait();

        return response;
    }
}

并且：

import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.scene.layout.*;
import javafx.scene.control.*;

public class TextBox {

    private static String response;

    static String display(String title, String message) {
        Stage window = new Stage();
        window.setTitle(title);
        window.initModality(Modality.APPLICATION_MODAL);

        Label label = new Label(message);
        TextField input = new TextField();
        Button confirmButton = new Button("Confirm");
        confirmButton.setOnAction(e -> {
             response = input.getText();
             window.close();
        });

        VBox layout = new VBox(5);
        layout.getChildren().addAll(label, input, confirmButton);

        Scene textBox = new Scene(layout, 250, 80);
        window.setScene(textBox);
        window.showAndWait();

        return response;
    }
}

和播放器类：

import java.io.*;
import java.util.*;

public class Player {

    private String name;
    private int totalWins = 0;
    private int othelloWins = 0;
    private int connectFourWins = 0;

    private static ArrayList<Player> playerList = new ArrayList<>(1);

    private Player(String input) {
        name = input;
    }
    private Player(String input, int othello, int connectFour, int total) {
        name = input;
        othelloWins = othello;
        connectFourWins = connectFour;
        totalWins = total;
    }

    void addOthelloWin() {
        othelloWins++;
        totalWins++;
    }
    void addConnectFourWin() {
        connectFourWins++;
        totalWins++;
    }
    void changeName(String input) {
        name = input;
    }

    static ArrayList<Player> getPlayerList() {
        return playerList;
    }
    static Player getPlayer(String input) {
        for(int i = 0; i < playerList.size(); i++) {
            if(playerList.get(i).name.equals(input)) {
                return playerList.get(i);
            }
        }
        return null;
    }
    String getName() {
        return name;
    }
    int getOthelloWins() {
        return othelloWins;
    }
    int getConnectFourWins() {
        return connectFourWins;
    }
    int getTotalWins() {
        return totalWins;
    }

    static void printWins() {
        System.out.println("Names\t\tOthello\t\tConnect4\t\tTotal" + "\n");
        for(int i = 0; i < playerList.size(); i++)
            System.out.println(playerList.get(i).name + "\t\t\t" + playerList.get(i).othelloWins + "\t\t\t" +
                    playerList.get(i).connectFourWins + "\t\t\t" + playerList.get(i).totalWins);
        System.out.println();
    }

    static void addNewPlayer(String name) throws IOException {
        Player newPlayer = new Player(name);
        playerList.add(newPlayer);

        File file = new File("player_Data.txt");
        FileWriter writer = new FileWriter(file, true);
        writer.write(newPlayer.name + "\t\t" + newPlayer.othelloWins + "\t\t" + newPlayer.connectFourWins + "\t\t" + newPlayer.totalWins + System.lineSeparator());
        writer.close();
    }

    static boolean loadPlayers(){
        Scanner input;

        try {
            File file = new File("player_Data.txt");
            input = new Scanner(file);
        } catch (FileNotFoundException e) {
            return false;
        }

        while (input.hasNextLine()) {
            try {
                String line = input.nextLine();
                String[] lineArray = line.split("\t\t");
                Player newPlayer = new Player(lineArray[0], Integer.parseInt(lineArray[1]), Integer.parseInt(lineArray[2]), Integer.parseInt(lineArray[3]));
                playerList.add(newPlayer);
            } catch (Exception e) {
                System.out.println("Player data incorrectly formatted.");
                break;
            }
        }
        return true;
    }

    static void recordWins() throws IOException {
        File file = new File("player_Data.txt");
        FileWriter writer = new FileWriter(file);

        for(int i = 0; i < playerList.size(); i++) {
            writer.write(playerList.get(i).name + "\t\t" + playerList.get(i).othelloWins + "\t\t" + playerList.get(i).connectFourWins + "\t\t" + playerList.get(i).totalWins + System.lineSeparator());
        }
        writer.close();
    }
}

这是一个示例运行： Opening with no data

Adding player.

Scoreboard showing twice after adding a player.

After closing and restarting the program, scoreboard shows that players were added and loaded correctly.

这是我第一次尝试javafx应用程序，所以也许我对它的工作方式感到困惑。我的想法是我们只有一个窗口可以显示不同的场景。我有一个场景是主菜单，它由refreshMainMenu（）显示。每当我们添加新的播放器时，主菜单都会刷新，但是如果单击“ Othello”或“连接四”按钮，则将切换到Othello的场景或“连接四”的场景。这就是为什么在用户单击添加新播放器并添加播放器之后，我调用refreshMainMenu（），它将使用新播放器数据从头开始再次创建主菜单场景的原因。我尝试将移动到调用refreshMainMenu（）的位置，还尝试关闭窗口，然后调用refreshMainMenu（）。关闭窗口并再次调用刷新会导致出现相同的记分板问题。

这也是我在这里的第一篇文章，对不起，如果我违反任何规则或之前曾提出问题，我们深感抱歉。我进行了搜索，但找不到任何对我的案子有真正帮助的帖子。也有一些类可以运行Othello和Connect Four游戏，但是由于我还没有到达那里，它们现在仍在控制台中运行。如有必要，我可以添加代码。

Answer 1

调用refreshMainMenu()方法会使玩家列表上的现有玩家加倍。 if(!Player.loadPlayers())加载txt文件中存储的播放器，而无需检查播放器是否已经存储在Player.playerList列表中。

我决定提供帮助，因为您付出了很多努力来创建问题，并且根据代码的质量，我可以看到您刚刚开始使用JavaFx。几个好的建议。您不需要每次刷新时都更改场景。这是非常不好的做法。了解JavaFx中的可观察集合。玩家不应存储玩家列表。首先-学习使用调试器。