UsingFXCollections

FxTest.java

import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
public class FxTest {

    public static void main(String[] args) throws InterruptedException {
        
        ObservableList<String> names = FXCollections.observableArrayList();

        names.addListener(new ListChangeListener<String>() {
            @Override
            public void onChanged(Change<? extends String> c) {
                System.out.println("on Changed "+c);
            }
        });


        ExecutorService executorService = Executors.newSingleThreadExecutor();
        executorService.submit(() -> {

            for (int i = 0; i < 10; i++) {
                System.out.println("Adding ele");
                names.add("" + i);
            }
        });
        // TimeUnit.SECONDS.sleep(10);
        executorService.shutdown();
        executorService.awaitTermination(10, TimeUnit.MINUTES);
        System.out.println("Done");


    }
}