How to add data from a text file to ComboBox in JavaFX? - file

Question

I create a ComboBox in Scene Builder and I want to populate him with data from a text file (eg. Text.txt):
public class ToDoListController implements Initializable {
#FXML
private ComboBox<?> eventsSelector;
How to do this?
Thank you very much!
Two solutions:
1.
#FXML
private ComboBox eventsSelector;
#Override
public void initialize(URL location, ResourceBundle resources) {
List<String> myList;
try {
myList = Files.lines(Paths.get("path of my text file")).collect(Collectors.toList());
eventsSelector.setItems(FXCollections.observableArrayList(myList));
} catch (IOException e) {
System.out.println("Don t find file");
}
}
2.
//Read items from txt File
try {
BufferedReader br = new BufferedReader(new
FileReader("path of my text file"));
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
//Add Item
eventsSelector.getItems().add(line);
sb.append(line);
line = br.readLine();
}
br.close();
} catch (IOException e) {
System.out.println("Don t find file");
}

Answer 1

Since you want to add content from a .txt file the items in the ComboBox are Strings so you can change to this :
#FXML
private ComboBox<String> eventsSelector;
Then you need a list of the elements that you want to add to the ComboBox<String>, then you can add them simply by:
List<String> myList = Files.lines(path).collect(Collectors.toList());
comboBox.setItems(FXCollections.observableArrayList(myList));

Answer 2

I wrote some code for you, this should work for you:
public class YourController {
//Combobox
#FXML
ComboBox<String> combobx;
//Initialize FXML
#FXML
public void initialize() throws IOException {
//Read items from txt File
BufferedReader br = new BufferedReader(new FileReader("/items.txt"));
try {
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
//Add Item
combobx.getItems().add(line);
sb.append(line);
line = br.readLine();
}
} finally {
br.close();
}
//Default Selection first item
combobx.getSelectionModel().select(0);
}
}
The txt file must be in this case in the root directory of your project.