JavaFx无法将文本转换为textField，也无法将textField转换为文本？

Question

我想为我的Java类做一个应用程序。主要我们正在学习使用github，但是我的问题随JavaFX一起提供。我想在几个窗格和场景上创建一个窗体，当用户点击提交时，最后一个窗体应该放在文件中。

我的想法是将textfields传递给最后一个窗格有一个参数，并在按下submit按钮时创建一个bufferedwriter，将所有文本添加到一个新文件中。所以这个想法是完美的，我通过了一个窗格，因为所有的textField都在一个VBox里面，当我写它们时我会施放textFields，但是当我运行它时告诉我文本不能转换为文本字段，所以当我尝试将其转换为文本，它会告诉我相反的情况！该文本字段不能转换为文本！我在代码中使用textArea尝试缓冲区，它工作正常！我不明白为什么不与窗格IM传递

注意工作：就在我试图串联为一个字符串是否缓冲区是问题的结束，但它告诉我同样的错误，即使做这种方式

这是代码：

public class RulesPane extends VBox{ 
    public RulesPane(Stage mainStage, Scene mainScene, Pane pane) { 
     this.setAlignment(Pos.TOP_CENTER); 

     BackgroundImage background = new BackgroundImage(new Image("water.png",900,600,false,true), 
       BackgroundRepeat.REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.DEFAULT, 
        BackgroundSize.DEFAULT); 
     this.setBackground(new Background(background)); 

     File logoPath = new File("src/swimclub_Logo.png"); 
     Image logoImage = new Image(logoPath.toURI().toString()); 
     ImageView logo = new ImageView(logoImage); 

     TextArea agreement = new TextArea(); 
     agreement.setEditable(false); 
     agreement.setPrefHeight(400); 
     agreement.setMaxWidth(600); 
     agreement.setWrapText(true); 
     agreement.setText("This is text"); 

     CheckBox agree = new CheckBox("I Agree"); 

     HBox buttons = new HBox(); 
     buttons.setPadding(new Insets(50, 0, 0, 60)); 
     buttons.setSpacing(300); 

     Button back = new Button(); 
     back.setText("Back"); 
     back.setOnMouseClicked(e->{ 
      mainStage.setScene(mainScene); 
     }); 

     Button exit = new Button(); 
     exit.setText("Exit"); 
     exit.setOnMouseClicked(e->{ 
      Platform.exit(); 
     }); 

     Button submit = new Button(); 
     submit.setText("Submit Form"); 
     submit.setDisable(true); 
     submit.setOnMouseClicked(e->{ 
      File file = new File("user_info.txt"); 
      try { 
       BufferedWriter out = new BufferedWriter(new FileWriter(file)); 
       String contentToSave = ""; 
       for(int i = 0; i < pane.getChildren().size(); i++) 
        contentToSave += ((TextField) pane.getChildren().get(i)).getText(); 

       out.write(contentToSave); 
       out.flush(); 
       out.close(); 
      } catch (IOException e1) { 

       e1.printStackTrace(); 
      } 
     }); 


     //CheckBox event handler to make the submit button available or unavailable when pressed 
     agree.setOnAction(e->{ 
      if(agree.isSelected()) 
       submit.setDisable(false); 
      else 
       submit.setDisable(true); 
     }); 

     buttons.getChildren().addAll(back, exit, submit); 
     this.getChildren().addAll(logo , agreement, agree, buttons); 
     } 
} 

这是从

public class registration extends Application{ 

public static void main(String[] args) { 
    Application.launch(args); 
} 

public void start(Stage primaryStage) throws Exception { 
    BorderPane main = new BorderPane(); 
    VBox questions = new VBox(); 
    VBox titlePane = new VBox(); 
    HBox buttonPane = new HBox(); 


    Text title = new Text("Welcome to the Swimming Club Registration!"); 


    Text question1 = new Text("How did you hear about our club?"); 
    Text question2 = new Text("Have you ever been in any clubs for swimming before?"); 
    Text question3 = new Text("Do you swim competitvly or for fun?"); 

    TextField question1Answer = new TextField(); 
    TextField question2Answer = new TextField(); 
    TextField question3Answer = new TextField(); 
    question1Answer.setPromptText("Enter where you heard about our club (Internet, Flyer, etc)"); 
    question2Answer.setPromptText("Enter Yes or No"); 
    question3Answer.setPromptText("Enter Competitvly or Fun"); 

    Button cancelButton = new Button("Cancel"); 
    Button continueButton = new Button("Continue"); 

    File logoPath = new File("src/swimclub_Logo.png"); 
    Image logoImage = new Image(logoPath.toURI().toString()); 
    ImageView logo = new ImageView(logoImage); 

    buttonPane.getChildren().addAll(cancelButton, continueButton); 
    titlePane.getChildren().addAll(title, logo); 
    questions.getChildren().addAll(question1,question1Answer,question2,question2Answer,question3,question3Answer); 

    titlePane.setAlignment(Pos.CENTER); 
    buttonPane.setAlignment(Pos.CENTER); 

    titlePane.setPadding(new Insets(10,0,20,0)); 
    questions.setPadding(new Insets(0,10,0,10)); 
    buttonPane.setPadding(new Insets(0,0,10,0)); 

    main.setTop(titlePane); 
    main.setCenter(questions); 
    main.setBottom(buttonPane); 



    Scene scene = new Scene(main, 900, 600); 
    primaryStage.setScene(scene); 
    primaryStage.show(); 

    /** 
    * @josegeorges 
    * here I am adding the rules pane with the rules scene and setting up the 
    * continueButton to go to it for now 
    * I am also saving the textFields into a string and passing the content to the pane 
    */ 
    continueButton.setOnMouseClicked(e->{ 
    String contentToSave = ""; 
    contentToSave += question1Answer.getText() + ","; 
    contentToSave += question2Answer.getText() + ","; 
    contentToSave += question3Answer.getText() + ","; 

    RulesPane rulesPane = new RulesPane(primaryStage, scene, contentToSave); 
    RulesScene rulesScene = new RulesScene(rulesPane); 
     primaryStage.setScene(rulesScene); 
    }); 

} 

} 

Answer 1

未来既然不能看到那里的窗格究竟来自哪里，我会承担当你说你在VBox中有TextField时，VBox就在那个窗格中。如果是这样，问题看起来像是将TextFields投射到Pane，而不是TextFields投射到Pane的孩子们身上，如果它在VBox中，那么您仍然希望获得它（Vbox）的孩子。所以：

for (int i = 0; i < pane.getChildren().size(); i++) { 
    Node child1 = group.getChildren().get(i); 
    if (child1 instanceof VBox) { 
     for(Node child2:((VBox) child1).getChildren()) { 
      if (child2 instanceof TextField) { 
       contentToSave += (TextField) child2.getText(); 
      } 
      } 
     } 
    } 

而不是你为它试图使一个窗格成文本字段的试块循环，这会得到窗格中的孩子，假设他们VBOX（如果是这样，）然后得到VBox的孩子们，假设他们是TextFields（如果他们是）

如果这样做不行，我会建议您发布其余的代码（Pane是从哪里来的），以及究竟是什么错误抛出。