我做了很多搜索，似乎找不到解决我的问题的方法，当用户在Intro.fxml中输入他/她的名字时，我试图让标签 selectedName 更新并出现在Main.fxml上。但是它仍然显示为在initialize方法中设置的default_user。不可否认，代码有点乱，但它只是我正在研究的一个小项目。
LogicController.java 不是整个文件
public class LogicController{
/** CLASS OBJECTS
*
*/
private LoadWords loadWords = new LoadWords();
private GameLogic game = new GameLogic();
/** AUDIO FILES
* items used for audio
* All wavs are free
* provided on freesound.org
* **/
final URL resource = getClass().getResource("sounds/beep.wav");
final AudioClip menuClick = new AudioClip(resource.toString());
/** OTHER DECLARATIONS
* other variables
*
*
*/
@FXML public ChoiceBox<String> difficultyBox = new ChoiceBox<String>();
@FXML public ObservableList<String> difficultyBoxList = FXCollections.observableArrayList("Easiest", "Easy", "Medium", "Hard");
@FXML public String selectedDifficulty;
@FXML public TextField myName;
@FXML public Label selectedName = new Label();
@FXML
public void initialize()
{
difficultyBox.setItems(difficultyBoxList);
selectedName.setText("default_player");
}
@FXML
public void loadSerial(MouseEvent mouseEvent) {
menuClick.play();
loadWords.startSequential();
game.setAllLists(loadWords.getAllLists());
game.setDifficulty(difficultyBox.getSelectionModel().getSelectedItem().toString());
game.setName(myName.getText());
selectedName.setText(game.getName().toString());
try{
Node source = (Node) mouseEvent.getSource();
Stage intro = (Stage) source.getScene().getWindow();
intro.close();
Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));
root.setId("pane");
Scene scene = new Scene(root, 900, 506);
Stage primaryStage = new Stage();
primaryStage.setTitle("x");
scene.getStylesheets().addAll(this.getClass().getResource("application.css").toExternalForm());
primaryStage.setResizable(false);
primaryStage.setScene(scene);
primaryStage.show();
}catch(Exception e) {
e.printStackTrace();
}
}
Intro.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.ChoiceBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.effect.DropShadow?>
<?import javafx.scene.effect.Glow?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.FlowPane?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="fx" prefHeight="538.0" prefWidth="923.0" style="-fx-background-color: #4f0f41;" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.LogicController">
<children>
<StackPane prefHeight="538.0" prefWidth="923.0">
<children>
<Pane prefHeight="545.0" prefWidth="929.0">
<children>
<Label layoutX="265.0" layoutY="101.0" prefHeight="103.0" prefWidth="394.0" style="-fx-font-family: Paperland; -fx-font-size: 90;" stylesheets="@application.css" text="FANGMAN" textFill="WHITE">
<effect>
<Glow />
</effect>
<font>
<Font size="66.0" />
</font>
</Label>
<Label layoutX="265.0" layoutY="69.0" prefHeight="65.0" prefWidth="79.0" style="-fx-font-family: Paperland; -fx-font-size: 40;" stylesheets="@application.css" text="THE" textFill="WHITE">
<effect>
<Glow />
</effect>
</Label>
<Label layoutX="694.0" layoutY="24.0" text="An adaptation by Benjamin Meysner" textFill="WHITE" />
<FlowPane layoutX="266.0" layoutY="288.0" prefHeight="225.0" prefWidth="378.0">
<children>
<GridPane prefHeight="230.0" prefWidth="398.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="171.0" minWidth="10.0" prefWidth="171.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="265.0" minWidth="10.0" prefWidth="64.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="233.0" minWidth="0.0" prefWidth="152.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints />
<RowConstraints maxHeight="51.0" minHeight="5.0" prefHeight="48.0" />
<RowConstraints maxHeight="172.0" minHeight="10.0" prefHeight="109.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="78.0" minHeight="10.0" prefHeight="41.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<ImageView id="zomb" fx:id="zomb" fitHeight="150.0" fitWidth="200.0" onMouseClicked="#loadSerial" onMouseEntered="#zombieHover" pickOnBounds="true" preserveRatio="true" style="-fx-cursor: hand;" styleClass="zomb" GridPane.rowIndex="2">
<image>
<Image url="@images/chtr1.png" />
</image>
<effect>
<Glow />
</effect>
</ImageView>
<ImageView id="skul" fitHeight="150.0" fitWidth="200.0" onMouseClicked="#loadParallel" onMouseEntered="#skulHover" pickOnBounds="true" preserveRatio="true" style="-fx-cursor: hand;" styleClass="skul" GridPane.columnIndex="2" GridPane.rowIndex="2">
<image>
<Image url="@images/chtr3.png" />
</image>
<effect>
<Glow />
</effect>
</ImageView>
<Label alignment="CENTER" style="-fx-font-family: Paperland;" text="OR" textFill="WHITE" GridPane.columnIndex="1" GridPane.rowIndex="2">
<font>
<Font size="50.0" />
</font>
<effect>
<Glow />
</effect>
</Label>
<Label text="Serial" textFill="WHITE" GridPane.rowIndex="3" />
<Label text="Parallel" textFill="WHITE" GridPane.columnIndex="2" GridPane.rowIndex="3" />
</children>
</GridPane>
</children>
</FlowPane>
<ImageView fitHeight="104.0" fitWidth="113.0" layoutX="156.0" layoutY="90.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@images/drac.png" />
</image>
</ImageView>
<Label layoutX="252.0" layoutY="262.0" prefHeight="52.0" prefWidth="137.0" text="Now enter your name..." textFill="WHITE" />
<Label layoutX="252.0" layoutY="203.0" prefHeight="78.0" prefWidth="137.0" text="To begin a new game, select a difficulty setting..." textFill="WHITE" wrapText="true" />
<TextField fx:id="myName" layoutX="405.0" layoutY="276.0" promptText="Enter name...">
<effect>
<DropShadow height="71.4" radius="30.7525" spread="0.13" width="53.61" />
</effect></TextField>
<Label layoutX="115.0" layoutY="281.0" prefHeight="78.0" prefWidth="137.0" text="Finally select a load option (Serial or Parallel)" textFill="WHITE" wrapText="true" />
<ChoiceBox fx:id="difficultyBox" layoutX="404.0" layoutY="225.0" prefWidth="150.0" value="Easiest">
<effect>
<DropShadow height="0.0" radius="29.2125" spread="0.19" width="118.85" />
</effect>
</ChoiceBox>
</children>
</Pane>
</children>
</StackPane>
</children>
</AnchorPane>
Main.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.effect.Glow?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.text.Font?>
<AnchorPane style="-fx-background-color: #4f0f41;" stylesheets="@application.css" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.LogicController">
<children>
<Pane prefHeight="506.0" prefWidth="900.0" stylesheets="@application.css">
<children>
<ImageView fitHeight="197.0" fitWidth="183.0" layoutX="35.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@images/drac.png" />
</image>
</ImageView>
<Label layoutX="37.0" layoutY="223.0" text="Welcome" textFill="WHITE" />
<Label fx:id="selectedName" layoutX="97.0" layoutY="218.0" prefHeight="27.0" prefWidth="121.0" text=" " textFill="WHITE">
<font>
<Font size="13.0" />
</font>
<effect>
<Glow />
</effect>
</Label>
<Pane layoutX="24.0" layoutY="211.0" opacity="0.45" prefHeight="127.0" prefWidth="200.0" style="-fx-background-color: BLACK;">
<children>
<GridPane layoutX="13.0" layoutY="34.0" prefHeight="81.0" prefWidth="153.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label text="Games Won" textFill="WHITE" />
<Label text="Games Lost" textFill="WHITE" GridPane.rowIndex="1" />
<Label text="Win Ratio" textFill="WHITE" GridPane.rowIndex="2" />
<Label text="0" textFill="WHITE" GridPane.columnIndex="1" />
<Label text="0" textFill="WHITE" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<Label text="0%" textFill="WHITE" GridPane.columnIndex="1" GridPane.rowIndex="2" />
</children>
</GridPane>
</children>
</Pane>
<Pane layoutX="246.0" layoutY="61.0" opacity="0.45" prefHeight="421.0" prefWidth="633.0" style="-fx-background-color: BLACK;" />
<Button layoutX="355.0" layoutY="22.0" mnemonicParsing="false" prefHeight="26.0" prefWidth="100.0" text="save game" />
<Pane layoutX="25.0" layoutY="373.0" opacity="0.45" prefHeight="104.0" prefWidth="200.0" style="-fx-background-color: BLACK;" />
<Button layoutX="244.0" layoutY="22.0" mnemonicParsing="false" prefHeight="26.0" prefWidth="100.0" text="load game" />
<Button layoutX="469.0" layoutY="22.0" mnemonicParsing="false" onAction="#newWord" prefHeight="26.0" prefWidth="100.0" text="new word" />
<Label layoutX="28.0" layoutY="484.0" text="message box" textFill="WHITE" />
<Label layoutX="28.0" layoutY="346.0" text="statistics" textFill="WHITE" />
<Label layoutX="246.0" layoutY="484.0" text="game view" textFill="WHITE" />
</children>
</Pane>
</children>
</AnchorPane>
此处的图片 intro.fxml main.fxml 任何帮助将不胜感激！
答案 0 :(得分：2)
与Intro.fxml一起使用的控制器实例与Main.fxml使用的实例不同。您需要在加载fxml之前指定控制器实例以使用相同的实例：
FXMLLoader loader = new FXMLLoader(getClass().getResource("Main.fxml"));
loader.setController(this);
Parent root = loader.load();
// fill data to the field just created when loading the fxml
selectedName.setText(game.getName().toString());
（这需要从fx:controller删除Main.fxml属性。）
请注意，这种方式初始化被调用两次。恕我直言，最好使用单独的控制器。
有多种方法可以将信息传递给fxml文件的控制器，这种方法可能比上述方法更适合，例如：访问由FXMLLoader创建的控制器实例。
请注意，初始化应该从fxml注入以防止NPE的字段很少是一个好主意，因为这只是错误的症状，并且初始化字段的值与从中创建的对象没有任何关联。 FXML。
答案 1 :(得分：1)
您的变量已经注释@FXML，因此无需实例化它：
//Wrong
@FXML public Label selectedName = new Label ();
//Correct
@FXML public Label selectedName;
编辑：
对于其他带注释的项目也是如此，并尝试实现Initializable：
LogicController implements Initializable{