JavaFX how to update label text value every time? - javafx-8

Question

I am using IntellijIDEA. I have ui.fxml,Controller.java and GUI.java. Here is code:
ui.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<AnchorPane id="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-1.0" minWidth="-1.0" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="sample.Controller">
<children>
<Button fx:id="exitBtn" cancelButton="true" layoutX="530.0" layoutY="366.0" mnemonicParsing="false" text="Exit" />
<Button fx:id="stopBtn" layoutX="460.0" layoutY="367.0" mnemonicParsing="false" text="Stop" />
<Button fx:id="startBtn" layoutX="387.0" layoutY="368.0" mnemonicParsing="false" text="Start" />
<Label fx:id="threadsLabel" layoutX="19.0" layoutY="23.0" prefWidth="45.0" text="Threads" />
<Label fx:id="threadsValue" layoutX="160.0" layoutY="26.0" prefWidth="45.0" text="0" />
<Label fx:id="smLabel" layoutX="19.0" layoutY="42.0" prefWidth="108.0" text="submit_sm sended" />
<Label fx:id="smValue" layoutX="160.0" layoutY="42.0" prefWidth="45.0" text="0" />
<Label fx:id="deliverLabel" layoutX="19.0" layoutY="61.0" prefWidth="115.0" text="deliver_sm received" />
<Label fx:id="deliverValue" layoutX="160.0" layoutY="61.0" prefWidth="45.0" text="0" />
<Label fx:id="tpsLabel" layoutX="19.0" layoutY="77.0" prefWidth="78.0" text="Current TPS" />
<Label fx:id="tpsValue" layoutX="160.0" layoutY="77.0" prefWidth="45.0" text="0" />
<Slider fx:id="speed" layoutX="213.0" layoutY="28.0" max="1000.0" min="10.0" prefWidth="317.0" showTickLabels="true" showTickMarks="false" />
</children>
</AnchorPane>
GUI.java
public class GUI extends Application {
public Logger log = Main.getLogger("log");
#Override
public void start(Stage primaryStage) throws Exception{
FXMLLoader loader = new FXMLLoader();
Parent root = loader.load(getClass().getResource("ui.fxml"));
primaryStage.setTitle("ESME Emulator");
Scene mainScene = new Scene(root, 600, 400);
primaryStage.setScene(mainScene);
primaryStage.show();
}
public void show(String[] args) {
launch(args);
}
}
Controller.java
public class Controller implements Initializable {
public Logger log=Main.getLogger("log");
#FXML
public ResourceBundle resources;
#FXML
public URL location;
#FXML
public Label deliverLabel;
#FXML
public Label deliverValue;
#FXML
public Button exitBtn;
#FXML
public Label smLabel;
#FXML
public Label smValue;
#FXML
public Slider speed;
#FXML
public Button startBtn;
#FXML
public Button stopBtn;
#FXML
public Label threadsLabel;
#FXML
public Label threadsValue;
#FXML
public Label tpsLabel;
#FXML
public Label tpsValue;
public Sample sample;
public Controller()
{
this.sample=new Sample(this);
}
public void initialize(URL location, ResourceBundle resources) {
stopBtn.setDisable(true);
startBtn.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
try {
Main.startEmulation();
startBtn.setDisable(true);
stopBtn.setDisable(false);
}catch(Exception e)
{
log.error("Exception while \"Start\" button click event: "+e.getMessage());
}
}
});
stopBtn.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
try {
Main.stopEmulation();
startBtn.setDisable(false);
stopBtn.setDisable(true);
}catch(Exception e)
{
log.error("Exception while \"Stop\" button click event: "+e.getMessage());
}
}
});
exitBtn.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
try {
Main.stopEmulation();
System.exit(0);
}catch(Exception e)
{
log.error("Exception while \"Exit\" button click event: "+e.getMessage());
}
}
});
}
}
and i have another java class which provides a while endless loop, and i need every iteration the threadsValue to be changed via thredsValue.setText("some text"), how can i do this?
p.s.excuse me for my english...
I did this, and still no result, whats wrong?
UpdateTask updTask = new UpdateTask();
Label.textProperty().bind(updTask.valueProperty());
Thread changes = new Thread(updTask);
changes.setDaemon(true);
changes.setName("UPDATE");
changes.start();
class UpdateTask extends Task<String> {
#Override
protected String call() throws Exception {
while(isRunning()) {
updateValue(Integer.toString(Main.getThreadsCount()));
}
return null;
}
}