java - 试图从Java调用JavaFX应用程序…NoSuchMethodException

我有一个主类，应该调用JavaFX应用程序(SimpleSun)从用户那里获取信息。目前，我创建了JavaFX类的Object并启动了它，但这似乎不起作用。有人看到我工作中的错误吗？

这是我的代码和异常:
Main.java:

package ch.i4ds.stix.sim;

import ch.i4ds.stix.sim.grid.config.Configuration;
import ch.i4ds.stix.sim.grid.config.ConfigurationFromFile;


    public class Main{
    Configuration config;
    public static void main(String[] args) {
        ConfigurationFromFile config = new ConfigurationFromFile();
        SimpleSun ss = new SimpleSun(config);
        ss.show();
    }
}

SimpleSun.java:

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import ch.i4ds.stix.sim.grid.config.Configuration;
import ch.i4ds.stix.sim.grid.config.ConfigurationFromFile;

public class SimpleSun extends Application{

    private Stage primaryStage;
    Configuration configuration;

    public SimpleSun(ConfigurationFromFile config) {
        this.configuration = config;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        this.primaryStage = primaryStage;
        this.primaryStage.setTitle("Simple Sun - Alpha");
        System.out.println("Test");
        try {
            // Load the root layout from the fxml file
            FXMLLoader loader = new FXMLLoader(
                    Main.class.getResource("view/RootLayout.fxml"));
            BorderPane rootLayout = (BorderPane) loader.load();
            Scene scene = new Scene(rootLayout);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch (IOException e) {
            // Exception gets thrown if the fxml file could not be loaded
            e.printStackTrace();
        }
    }

    public void show(){
        launch();
    }

}

异常(exception):

Exception in Application constructor
Exception in thread "main" java.lang.RuntimeException: Unable to construct Application instance: class ch.i4ds.stix.sim.SimpleSun
    at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.access$000(Unknown Source)
    at com.sun.javafx.application.LauncherImpl$1.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodException: ch.i4ds.stix.sim.SimpleSun.<init>()
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.getConstructor(Unknown Source)
    ... 4 more

最佳答案

扩展应用程序时，必须提供不带参数的构造函数。因此，您可以执行以下操作:

public class SimpleSun extends Application {

    private Stage primaryStage;
    Configuration configuration;

    public SimpleSun() {
        this.configuration = Main.getConfig();
    }
    //...

并在Main类中:

public static Configuration getConfig() { return new ConfigurationFromFile(); }

或者，您可以使用String将launch(args)参数传递给该类，然后使用SimpleSun将它们返回到getParameters()类中。