Array of Button in JavaFX using Scene Builder

Question

Lets say I have two buttons in the FXML for 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 I want to have it as an array of buttons in the controller class. How can I go about and do that? I have tried:

public Button button1, button2;
public Button[] arrayButtons = {button1, button2}

and also tried making a 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 as it gives me a runtime exception when I try to do something with the array (ie. arrayButton[1].setText("Test")):

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

How can I go about and have an array of Button where the elements are from fx:id?

Just rename initializeButtonArray to initialize (or call the initializeButtonArray() method from initialize()). — James_D
– James_D, Commented Nov 17, 2016 at 17:56

GOXR3PLUS · Accepted Answer · 2016-11-18 08:39:54Z

1

Here you are:

1)@FXML annotation is used cause the Objects are private.In case you make them public there is no need to use @FXML

2)As soon as FXMLLoader has loaded the controller the initialize method is called.Inside it you are sure that every object linked with fxml scene graph has been initialized.

🏁Code(Obviously this is one way and you can do it 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;
 } 

}

edited Nov 18, 2016 at 8:39

answered Nov 17, 2016 at 19:54

GOXR3PLUS

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