加载FXML时解析“onAction”时出错
我在运行一个简单的hello world应用程序时遇到了一些问题。 它抛出以下错误：
Exception in Application start method Exception in thread "main" java.lang.RuntimeException: Exception in Application start method at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(LauncherImpl.java:182) at com.sun.javafx.application.LauncherImpl$$Lambda$2/1329552164.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Caused by: javafx.fxml.LoadException: Error resolving onAction='#printHello', either the event handler is not in the Namespace or there is an error in the script. /home/willi/java/IdeaProjects/JavaFXApp/out/production/JavaFXApp/sample/sample.fxml:23 at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601) at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:104) at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:606) at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:766) at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2827) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2536) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108) at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101) at sample.Main.start(Main.java:13) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863) at com.sun.javafx.application.LauncherImpl$$Lambda$57/2085742749.run(Unknown Source) at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326) at com.sun.javafx.application.PlatformImpl$$Lambda$52/738441956.run(Unknown Source) at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295) at com.sun.javafx.application.PlatformImpl$$Lambda$55/689939224.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294) at com.sun.javafx.application.PlatformImpl$$Lambda$53/1382865734.run(Unknown Source) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139) at com.sun.glass.ui.gtk.GtkApplication$$Lambda$43/704249306.run(Unknown Source) ... 1 more 我的Controller.java文件中定义了printHello和printWorld方法，我想按下相应的按钮时调用它们。 代码如下：包样本;
import javafx.fxml.FXML; import javafx.scene.control.Button; import java.awt.event.ActionEvent; public class Controller { @FXML private Button helloButton; @FXML private Button worldButton; @FXML private void printHello(ActionEvent e){ System.out.println("Hello"); } @FXML private void printWorld(ActionEvent f){ System.out.println("World"); } }
`在我的fxml文件中，我定义了两个按钮。 他们的代码如下：
为什么我的代码会抛出此错误？
对于可怕的格式提前抱歉，这是我第一次发帖。
您在控制器类中导入了错误的ActionEvent 。
import java.awt.event.ActionEvent;
纠正它
import javafx.event.ActionEvent;