import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.util.Duration;

public class TimelineDemo extends Application {
    public void start(Stage primaryStage) {
        StackPane pane = new StackPane();
        Text text = new Text(20, 50, "Programming if fun");
        text.setFill(Color.RED);
        pane.getChildren().add(text);
// Create a handler for changing text
        EventHandler<ActionEvent> eH = e -> {
            if (text.getText().length() != 0) 
                text.setText("");
            else 
                text.setText("Programming is fun");
        };
        Timeline animation = new Timeline(new KeyFrame(Duration.millis(500), eH));
        animation.setCycleCount(Timeline.INDEFINITE);
        // Start animation
        animation.play();// Pause and resume animation
        text.setOnMouseClicked(e -> {
            if (animation.getStatus()== Animation.Status.PAUSED) 
                animation.play();
            else 
                animation.pause();
        });
        Scene scene = new Scene(pane, 250, 50);
        primaryStage.setTitle("TimelineDemo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}