我从JavaFX开始。
这个错误发生在我执行程序时,在我尝试执行之前,它运行良好,按钮点击也正常,但那是在我打算让按钮点击更改文本之前。
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.SceneController">
<children>
<AnchorPane layoutX="-100.0" layoutY="-224.0" prefHeight="572.0" prefWidth="430.0">
<children>
<Button layoutX="205.0" layoutY="253.0" mnemonicParsing="false" onAction="#handleActionButton1" text="Do you want swag?" />
<Text fx:id="myLabel" layoutX="280.0" layoutY="339.0" strokeType="OUTSIDE" strokeWidth="0.0" text="My text will change!" />
</children>
</AnchorPane>
</children>
</AnchorPane>
这就是FXML,在行中,您可以看到文本是"我的文本将更改!"。在Eclipse的FXML文本编辑器上,它给了我这样的错误:"您不能将‘text’分配给控制器字段‘Label’"。
这是我的SceneController类:
package application;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
public class SceneController{
@FXML
private Label myLabel;
@FXML
public void handleActionButton1(ActionEvent event){
System.out.println("Hello World!");
myLabel.setText("Hello World!");
}
}
正如我上面提到的,在我有标签之前,它会成功地在控制台上输出"Hello World",但现在它做到了,但没有执行我的Java应用程序,这给了我一个很长的错误:
javafx.fxml.LoadException:
/C:/Users/Neil/development/JavaFX/bin/application/appfxml.fxml:14
at javafx.fxml.FXMLLoader.constructLoadException(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:15)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(Unknown Source)
at com.sun.javafx.application.LauncherImpl$$Lambda$51/1299755900.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$45/1051754451.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$164(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/1698159280.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/1775282465.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/1109371569.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Can not set javafx.scene.control.Label field application.SceneController.myLabel to javafx.scene.text.Text
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(Unknown Source)
at java.lang.reflect.Field.set(Unknown Source)
at javafx.fxml.FXMLLoader.injectFields(Unknown Source)
在您的FXML
中,您定义了一个Text
,与在Controller中一样,您正试图将其用作Label
。
stackTrace(错误)正在声嘶力竭地大喊:
无法设置javafx.scene.control.Label字段应用SceneController.my标签到javafx.scene.text.text
在控制器中,您需要将myLabel
定义更改为
@FXML
private Text myLabel;