[输出] x1c 0d1x
我尝试过的事情：

• 更改系统字体
• 升级javafx版本到20（当前）
• 检查语言/区域设置

以下是所有文件（添加的主要和次要fxml文件）：

###################################################################

[App.java]

// I have imported all the necessary library

public class App extends Application {

    private static Scene scene;

    @Override
    public void start(Stage stage) throws IOException {
        scene = new Scene(loadFXML("primary"), 640, 480);
        stage.setScene(scene);
        stage.show();
    }

    static void setRoot(String fxml) throws IOException {
        scene.setRoot(loadFXML(fxml));
    }

    private static Parent loadFXML(String fxml) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource(fxml + ".fxml"));
        return fxmlLoader.load();
    }

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

[PrimaryController.java]

public class PrimaryController {

    @FXML
    private void switchToSecondary() throws IOException {
        App.setRoot("secondary");
    }
}

[SecondaryController.java]

public class SecondaryController {

    @FXML
    private void switchToPrimary() throws IOException {
        App.setRoot("primary");
    }
}

primary.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.VBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Button?>
<?import javafx.geometry.Insets?>

<VBox alignment="CENTER" spacing="20.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="testing.PrimaryController">
   <children>
      <Label text="Primary View" />
      <Button fx:id="primaryButton" text="Switch to Secondary View" onAction="#switchToSecondary"/>
   </children>
   <padding>
      <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
   </padding>
</VBox>

secondary.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.VBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Button?>
<?import javafx.geometry.Insets?>

<VBox alignment="CENTER" spacing="20.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="testing.SecondaryController">
    <children>
        <Label text="Secondary View" />
        <Button fx:id="secondaryButton" text="Switch to Primary View" onAction="#switchToPrimary" />
    </children>
    <padding>
        <Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
    </padding>
</VBox>