StockPriceTable.java

import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import javafx.application.Application;
import javafx.beans.property.FloatProperty;
import javafx.beans.property.SimpleFloatProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.concurrent.Task;
import javafx.concurrent.WorkerStateEvent;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class StockPriceTable extends Application {

    private final Random rng = new Random();

	@Override
	public void start(Stage primaryStage) {
		final TableView<StockPrice> priceTable = new TableView<>();
		final TableColumn<StockPrice, String> codeCol = new TableColumn<>("Code");
		codeCol.setCellValueFactory(new PropertyValueFactory<>("code"));
		final TableColumn<StockPrice, Float> priceCol = new TableColumn<>("Price");
		priceCol.setCellValueFactory(new PropertyValueFactory<>("price"));
		priceTable.getColumns().addAll(codeCol, priceCol);
		
		for (int i=0; i<20; i++) {
		    priceTable.getItems().add(randomStock());
		}
		
		final BorderPane root = new BorderPane();
		root.setCenter(priceTable);
		
		final ExecutorService exec = Executors.newFixedThreadPool(4, new ThreadFactory() {
            
            @Override
            public Thread newThread(Runnable r) {
                Thread t = new Thread(r);
                t.setDaemon(true);
                return t ;
            }
        }); 
		
		final Button updateButton = new Button("Refresh");
		updateButton.setOnAction(new EventHandler<ActionEvent>() {
            
            @Override
            public void handle(ActionEvent event) {
                for (final StockPrice sp : priceTable.getItems()) {
                    final float currentPrice = sp.getPrice();
                    final Task<Float> task =  new Task<Float>() {
                        @Override
                        public Float call() throws Exception {
                            Thread.sleep(rng.nextInt(500));
                            return currentPrice * (0.9f + rng.nextFloat() * 0.2f);
                        }
                    };
                    task.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
                        @Override
                        public void handle(WorkerStateEvent event) {
                            sp.setPrice(task.getValue());
                        }
                    });
                    exec.execute(task);
                }
            }
        }); 
		
		final HBox controls = new HBox(5);
		controls.setPadding(new Insets(10));
		controls.setAlignment(Pos.CENTER);
		controls.getChildren().add(updateButton);
		
		root.setBottom(controls);
		final Scene scene = new Scene(root, 400, 600);
		primaryStage.setScene(scene);
		primaryStage.show();
	}
	
	private StockPrice randomStock() {
	    String code = "" ;
	    for (int i=0; i<4; i++) {
	        code = code + (char)('A' + rng.nextInt(25));
	    }
	    float price = rng.nextFloat() * 200 ;
	    return new StockPrice(code, price);
	}
	
	public final static class StockPrice {
	    private final StringProperty code ;
	    private final FloatProperty price ;
	    public StockPrice(String code, float price) {
	        this.code = new SimpleStringProperty(this, "code", code);
	        this.price = new SimpleFloatProperty(this, "price", price);
	    }
	    
	    public float getPrice() {
	        return price.get();
	    }
	    public void setPrice(float price) {
	        this.price.set(price);
	    }
	    public FloatProperty priceProperty() {
	        return price ;
	    }
	    public String getCode() {
	        return code.get() ;
	    }
	    public void setCode(String code) {
	        this.code.set(code);
	    }
	    public StringProperty codeProperty() {
	        return code ;
	    }
	}

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