import static javafx.scene.control.SelectionMode.MULTIPLE; 

import javafx.application.Application; 
import javafx.application.Platform; 
import javafx.beans.property.SimpleObjectProperty; 
import javafx.collections.FXCollections; 
import javafx.collections.ObservableList; 
import javafx.scene.Scene; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TableView; 
import javafx.scene.layout.HBox; 
import javafx.stage.Stage; 


public class Main2 extends Application { 

final ObservableList<SimpleObjectProperty<Integer>> listitems = FXCollections.observableArrayList(); 
private static int ITEM_COUNT = 50000; 

public Main2() { 
for (int i = 0; i < ITEM_COUNT; ++i) { 
listitems.add(new SimpleObjectProperty<>(i)); 
} 
} 

@Override 
public void start(Stage primaryStage) { 
final TableView<SimpleObjectProperty<Integer>> lv = new TableView<>(); 
final TableColumn<SimpleObjectProperty<Integer>, Integer> c = new TableColumn<>(); 
c.setCellValueFactory(TableColumn.CellDataFeatures::getValue); 
lv.getColumns().add(c); 
lv.setItems(listitems); 

final HBox hbox = new HBox(); 
hbox.getChildren().add(lv); 
primaryStage.setScene(new Scene(hbox)); 

lv.getSelectionModel().setSelectionMode(MULTIPLE); 

primaryStage.show(); 
Platform.runLater(() -> { 
long startMillis = System.currentTimeMillis(); 
lv.getSelectionModel().selectAll(); 
System.out.println("item count " + ITEM_COUNT + " took " + (System.currentTimeMillis() - startMillis)); 
System.exit(1); 
}); 
} 

public static void main(String[] args) { 
Application.launch(args); 
} 
}