JavaFX Stopwatch Timer

Question

This is a class for a simple stopwatch for JavaFX, create a Label object if necessary

package aaa; import java.text.SimpleDateFormat; import java.util.Date; import javafx.beans.property.SimpleStringProperty; /** * * @author D07114915 */ public class KTimer extends Thread { private Thread thread = null; private SimpleDateFormat sdf = new SimpleDateFormat("mm:ss:S"); private String[] split; private SimpleStringProperty min, sec, millis, sspTime; private long time; public static void main(String[] args) { KTimer t = new KTimer(); t.startTimer(00); } public KTimer() { min = new SimpleStringProperty("00"); sec = new SimpleStringProperty("00"); millis = new SimpleStringProperty("00"); sspTime = new SimpleStringProperty("00:00:00"); } public void startTimer(long time) { this.time = time; thread = new Thread(this); thread.setPriority(Thread.MIN_PRIORITY); thread.start(); } public void stopTimer(long time) { if (thread != null) { thread.interrupt(); } this.time = time; setTime(time); } public void setTime(long time) { this.time = time; split = sdf.format(new Date(time)).split(":"); min.set(split[0]); sec.set(split[1]); if (split[2].length() == 1) { split[2] = "0" + split[2]; } millis.set(split[2].substring(0, 2)); sspTime.set(min.get() + ":" + sec.get() + ":" + millis.get()); } public long getTime() { return time; } public SimpleStringProperty getSspTime() { return sspTime; } @Override public void run() { try { while (!thread.isInterrupted()) { setTime(time); sleep(10); time = time + 10; } } catch (Exception e) { } } }//end of class 

Now just get the property listener for your GUI

Add vars

  KTimer ktimer; Label timeLabel; 

initialize vars in your class

  //Clock ktimer = new KTimer(); timeLabel = new Label(ktimer.getSspTime().get()); ktimer.getSspTime().addListener(new InvalidationListener() { @Override public void invalidated(Observable observable) { timeLabel.setText(ktimer.getSspTime().get()); } }); 

then call the method to start and stop where you need

Stop and reset

  ktimer.stopTimer(0); 

Start and Pause Timer

  ktimer.startTimer(ktimer.getTime()); 

Any improvements that are evaluated as a class are a bit hungry CPU ... but you can tweak the run thread and setTime (time) functions according to the application

Answer 1

Here's a slightly different version (maybe better), and I'm not sure if synchronized methods are really necessary

 package aaa; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Timer; import java.util.TimerTask; import javafx.beans.property.SimpleStringProperty; /** * * @author D07114915 */ public class KTimer { private SimpleDateFormat sdf = new SimpleDateFormat("mm:ss:S"); private String[] split; private SimpleStringProperty sspTime; private long time; private Timer t = new Timer("Metronome", true); private TimerTask tt; boolean timing = false; public KTimer() { sspTime = new SimpleStringProperty("00:00:00"); } public void startTimer(final long time) { this.time = time; timing = true; tt = new TimerTask() { @Override public void run() { if (!timing) { try { tt.cancel(); } catch (Exception e) { e.printStackTrace(); } } else { updateTime(); } } }; t.scheduleAtFixedRate(tt, 10, 10); } public synchronized void stopTimer() { timing = false; } public synchronized void updateTime() { this.time = this.time + 10; split = sdf.format(new Date(this.time)).split(":"); sspTime.set(split[0] + ":" + split[1] + ":" + (split[2].length() == 1 ? "0" + split[2] : split[2].substring(0, 2))); } public synchronized void moveToTime(long time) { stopTimer(); this.time = time; split = sdf.format(new Date(time)).split(":"); sspTime.set(split[0] + ":" + split[1] + ":" + (split[2].length() == 1 ? "0" + split[2] : split[2].substring(0, 2))); } public synchronized long getTime() { return time; } public synchronized SimpleStringProperty getSspTime() { return sspTime; } } 

Answer 2

Based on KEV's answer and various demo records I found over the Internet, here is a simple “count” timer with 100 ms accuracy:

 package fxtimer; import javafx.animation.KeyFrame; import javafx.animation.Timeline; import javafx.application.Application; import javafx.beans.property.DoubleProperty; import javafx.beans.property.SimpleDoubleProperty; import javafx.event.ActionEvent; import javafx.event.Event; import javafx.event.EventHandler; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.scene.paint.Color; import javafx.stage.Stage; import javafx.util.Duration; public class FXTimer extends Application { private Timeline timeline; private Label timerLabel = new Label(), splitTimerLabel = new Label(); private DoubleProperty timeSeconds = new SimpleDoubleProperty(), splitTimeSeconds = new SimpleDoubleProperty(); private Duration time = Duration.ZERO, splitTime = Duration.ZERO; @Override public void start(Stage primaryStage) { // Configure the Label // Bind the timerLabel text property to the timeSeconds property timerLabel.textProperty().bind(timeSeconds.asString()); timerLabel.setTextFill(Color.RED); timerLabel.setStyle("-fx-font-size: 4em;"); splitTimerLabel.textProperty().bind(splitTimeSeconds.asString()); splitTimerLabel.setTextFill(Color.BLUE); splitTimerLabel.setStyle("-fx-font-size: 4em;"); // Create and configure the Button Button button = new Button(); button.setText("Start / Split"); button.setOnAction(new EventHandler() { @Override public void handle(Event event) { if (timeline != null) { splitTime = Duration.ZERO; splitTimeSeconds.set(splitTime.toSeconds()); } else { timeline = new Timeline( new KeyFrame(Duration.millis(100), new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent t) { Duration duration = ((KeyFrame)t.getSource()).getTime(); time = time.add(duration); splitTime = splitTime.add(duration); timeSeconds.set(time.toSeconds()); splitTimeSeconds.set(splitTime.toSeconds()); } }) ); timeline.setCycleCount(Timeline.INDEFINITE); timeline.play(); } } }); // Setup the Stage and the Scene (the scene graph) StackPane root = new StackPane(); Scene scene = new Scene(root, 300, 250); // Create and configure VBox // gap between components is 20 VBox vb = new VBox(20); // center the components within VBox vb.setAlignment(Pos.CENTER); // Make it as wide as the application frame (scene) vb.setPrefWidth(scene.getWidth()); // Move the VBox down a bit vb.setLayoutY(30); // Add the button and timerLabel to the VBox vb.getChildren().addAll(button, timerLabel, splitTimerLabel); // Add the VBox to the root component root.getChildren().add(vb); primaryStage.setTitle("FX Timer"); primaryStage.setScene(scene); primaryStage.show(); } /** * @param args the command line arguments */ public static void main(String[] args) { launch(args); } }