Question

A game clock that starts at zero and begins to count up in seconds. Add buttons to pause and resume the clock. Given this initial code:

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.stage.Stage;
import javafx.util.Duration;
import javafx.scene.paint.Color;

public class AnimationCounter2 extends Application{
@Override
public void start(Stage stage) throws Exception{
// Create the label and align its contents.
Label label = new Label("0");
label.setTextFill(Color.RED);
label.setStyle("-fx-font-size: 4em;");
label.setAlignment(Pos.CENTER);
EventHandler<ActionEvent> handler = event->{
int count = Integer.parseInt(label.getText());
count ++;
label.setText(String.valueOf(count));
};
// Build the keyframe.
Duration sec = new Duration(1000);
KeyFrame keyFrame = new KeyFrame(sec, handler);
// Build the time line animation.
Timeline timeline = new Timeline(keyFrame);
timeline.setCycleCount(15);
// Set the stage and show, and play the animation.
stage.setScene(new Scene(label, 300, 200));
stage.setTitle("Animation Counter");
stage.show();
timeline.playFromStart();
}
public static void main(String[] args)
   {
launch(args);
   }
}