带有控制器的 JavaFX 静态/非静态

Question

I've tried to make a little math program with JavaFX. I have a Button action in Controller 1:

@FXML
public void showCalc(ActionEvent event2) {
    layout.parabel_nullstelle_showCalc.setVariables(a, b, c, x1, x2, ze1, ze2, ze3, ze4, ze5, ze6, ze7);
    Parent root3 = main.Main.getParent();
    Scene showCalc = new Scene(root3, 500, 1000);
    Stage paranullCalc = new Stage();
    paranullCalc.setTitle("Rechung");
    paranullCalc.setScene(showCalc);
    paranullCalc.show();
}

It opens a new Stage with Scene which contains a calculation. In the Controller for the showCalc I have the set variables method.

public static void setVariables(double a1, double b1, double c1,double x11, double x22, double ze11, double ze22, double ze33, double ze44, double ze55, double ze66, double ze77){
    a = (float) a1;
    b = (float) b1;
    c = (float) c1;
    x1 = (float) x11;
    x2 = (float) x22;
    ze1 = (float) ze11;
    ze2 = (float) ze22;
    ze3 = (float) ze33;
    ze4 = (float) ze44;
    ze5 = (float) ze55;
    ze6 = (float) ze66;
    ze7 = (float) ze77;
}

I needed to make it static because I can't do an object of a controller and with import I get the static/non static error. But now I want to change the text of a TextArea in the same Scene as the setVariables , so I can show the calculation. I can't make the TextArea static, because then it crashes. I also can't access it without static and creating an object of itself also isn't a solution. So how do I solve this?

Answer 1

Don't make variables or methods in your controller static solely for the purpose of being able to access them from elsewhere. It rarely, if ever, makes sense to have static members in a controller.

To access a method in a controller, just retrieve the controller instance from the FXMLLoader . You haven't really posted enough code to provide a complete answer, but you need to do something like:

FXMLLoader loader = new FXMLLoader(getClass().getResource("calc.fxml"));
Parent calcRoot = loader.load();
CalcController controller = loader.getController();
controller.setVariables(...);
Scene showCalc = new Scene(calcRoot, 500, 1000);
// ...

and remove static from the setVariables method declaration in the controller class.