无法将项目添加到Combobox

Question

我尝试通过FXML文件将项目添加到组合框中,但是我收到了这个错误.

    javafx.fxml.LoadException: String is not a valid type.
/C:/Users/kim/Desktop/JavaFX/ComboboxFx/bin/application/Main.fxml:13

    at javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
    at javafx.fxml.FXMLLoader.createElement(Unknown Source)
    at javafx.fxml.FXMLLoader.processStartElement(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
    at javafx.fxml.FXMLLoader.load(Unknown Source)
    at application.Main.start(Main.java:13)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(Unknown Source)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(Unknown Source)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

这是我的FXML

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

<?import javafx.collections.FXCollections?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="300.0" prefWidth="300.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" >
   <children>
      <ComboBox fx:id="comboBox">
        <items>
            <FXCollections fx:factory="observableArrayList">
                <String fx:value = "Gilbert" />
                <String fx:value = "John" />
            </FXCollections>
        </items>
      </ComboBox>
      <Label fx:id="selection" layoutX="34.0" layoutY="65.0" prefHeight="17.0" prefWidth="102.0" text="Label" />
   </children>
</AnchorPane>

主要的

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("/application/Main.fxml"));
            Scene scene = new Scene(root,400,400);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

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

当我通过场景构建器打开它时,我收到此错误

java.io.IOException: javafx.fxml.LoadException: Invalid attribute.

我已经仔细检查了一切,但代码似乎很好.当我删除我想要添加到FXML的值时,错误就消失了,但我的组合框变空了.它说String不是有效类型.我怎么解决这个问题？为什么它无效？我在这里检查了类似的问题,但错误是由于没有导入FXCollections引起的.我导入它所以我认为错误不是由导入错误引起的.

Answer 1

加

<?import java.lang.String?>

你的fxml.