java - Array of Button in JavaFX using Scene Builder -

lets have 2 buttons in fxml instance:

<button fx:id="button1" onaction="#onclick1" prefheight="134.0" prefwidth="134.0"></button> <button fx:id="button2" onaction="#onclick2" prefheight="134.0" prefwidth="134.0"></button> 

and want have array of buttons in controller class. how can go , that? have tried:

public button button1, button2; public button[] arraybuttons = {button1, button2} 

and tried making method:

public class controller {     public button button1, button2;     public button[] arraybuttons;      public void initializebuttonarray() {         arraybuttons = new button[2];         arraybuttons[1] = button1;         arraybuttons[2] = button2;     } } 

none of these work gives me runtime exception when try array (ie. arraybutton[1].settext("test")):

java.lang.runtimeexception: java.lang.reflect.invocationtargetexception 

how can go , have array of button elements fx:id?

here are:

1)@fxml annotation used cause objects private.in case make them public there no need use @fxml

2)as fxmlloader has loaded controller initialize method called.inside sure every object linked fxml scene graph has been initialized.

🏁code(obviously 1 way , can in various other ways):

public class controller {    @fxml private button button1;  @fxml private button button2;  public button[] arraybuttons;  @fxml public void initialize(){   initializebuttonarray();  }  public void initializebuttonarray() {       arraybuttons = new button[2];       arraybuttons[1] = button1;     arraybuttons[2] = button2;  }   }