java - EventHandler 不接受参数 - JavaFX

Question

这个问题已经有答案了:

JavaFX - setOnAction not applicable (2 个回答)

已关闭 6 年前。

我为“MainWindow.fxml”文件构建了一个相当简单的 Controller 来处理按钮。我关注了this教程。我已经在 fxml 文档中正确设置了 fx:id 。但是在编译时我收到以下错误警告

java: type java.beans.EventHandler does not take parameters

对于线路

createVizButton.setOnAction(new EventHandler<ActionEvent>(){

我的完整 Controller 类如下所示...

package sample;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import java.awt.event.ActionEvent;
import java.beans.EventHandler;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.scene.control.Button;

public class MainController implements Initializable{
    @FXML
    private Button createVizButton;
    @Override // This method is called by the FXMLLoader when initialization is complete
    public void initialize(URL fxmlFileLocation, ResourceBundle resources) {
        assert createVizButton != null : "fx:id=\"createButton\" was not injected: check your FXML file 'MainWindow.fxml'.";

        // initialize your logic here: all @FXML variables will have been injected
        createVizButton.setOnAction(new EventHandler<ActionEvent>(){
            @Override
            public void handle(ActionEvent event) {
                System.out.println("That was easy, wasn't it?");
            }
        });
    }
}

感谢任何帮助，提前致谢。

Answer 1

您的导入不正确:

import java.awt.event.ActionEvent;
import java.beans.EventHandler;

应该是

import javafx.event.ActionEvent;
import javafx.event.EventHandler;