Loop through multiple ComboBoxes to get data JavaFX - javafx

Question

I am trying loop through all the ComboBoxinstances I made in order to get the value the user picks and add that value to a new ArrayList, but I am stuck on how to proceed making the loop to get the values.
// row for comboboxes
HBox numBox = new HBox();
numBox.setSpacing(16);
numBox.setAlignment(Pos.CENTER);
vbox.getChildren().add(numBox);
// setup loop to create 8 combo boxes for user to pick
int comboNum = 8;
ComboBox<Integer> binaryBox = new ComboBox<Integer>();
for (int i = 0; i < comboNum; i++) {
binaryBox = new ComboBox<Integer>();
List<Integer> binaryList = new ArrayList<Integer>();
binaryList.add(0);
binaryList.add(1);
for (Integer num : binaryList) {
binaryBox.getItems().addAll(num);
}
binaryBox.setValue(0);
numBox.getChildren().add(binaryBox);
}
// way to get the value from each combo box
ChangeListener<Number> update =
(ObservableValue <? extends Number> ov, Number oldValue, Number newValue) -> {
for (int i = 0; i < comboNum; i++){
//todo
}
};

Answer 1

Each ComboBox has a SelectionModel from which you can obtain the selectedItem. First, create a list of combo boxes and populate it with your instances of ComboBox<Integer>:
List<ComboBox<Integer>> list = new ArrayList<>();
for (int i = 0; i < comboNum; i++) {
ComboBox<Integer> binaryBox = new ComboBox<Integer>();
list.add(binaryBox);
…
}
Later, you can loop through the list to retrieve the selected items using getSelectedItem():
for (ComboBox<Integer> combo : list) {
System.out.println(combo.getSelectionModel().getSelectedItem());
}