即使在eclipse中安装了javafx，我也无法运行javafx程序[重复]

Question

即使在Eclipse中安装了javafx程序，我也不能运行javafx程序。我在运行javafx程序后遇到的错误

Answer 1

public class HelloWorld extends Application {
//---------------------------------------------
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("My First JavaFX App");
BorderPane root = new BorderPane();
Button btnHello = new Button("Hello World");
root.setCenter(btnHello);
Scene scene = new Scene(root, 250, 100);
primaryStage.setScene(scene);
primaryStage.show();
}
//---------------------------------------------
public static void main(String[] args) {
launch(args);
}
}
'''