Java FX : How to call method from controller to another controller [closed]

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I woudlike to call method from another controller to enable/disable some Toggle Button.

Dashboard_controller :

// ENABLE BUTTON //

    public void setEnableBtn1() {
        btn1.setDisable(false);
    }
    public void setDisableBtn1() {
        btn1.setDisable(true);
    }

My another controller :

private dashboard_controller dashController; 

 public void initialize() throws IOException {
        String urlmain = "/view/main/main.fxml";
        FXMLLoader loader = new FXMLLoader(getClass().getResource(urlmain));
        dashController = new dashboard_controller();
        dashController = loader.getController();
        active();


private void active()
{
  dashController.setEnableBtn1();

}

But nothing change when I run my program. What I did wrong ?

来源：https://stackoverflow.com/questions/63153779/java-fx-how-to-call-method-from-controller-to-another-controller