mp3 music player

// JavaFX mp3 music player
package application;

import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;
import java.util.Timer;
import java.util.TimerTask;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.Slider;
import javafx.scene.layout.Pane;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.util.Duration;

public class Controller implements Initializable{
	
	@FXML
	private Pane pane;
	@FXML
	private Label songLabel;
	@FXML
	private Button playButton, pauseButton, resetButton, previousButton, nextButton;
	@FXML
	private ComboBox<String> speedBox;
	@FXML
	private Slider volumeSlider;
	@FXML
	private ProgressBar songProgressBar;
	
	private Media media;
	private MediaPlayer mediaPlayer;
	
	private File directory;
	private File[] files;
	
	private ArrayList<File> songs;
	
	private int songNumber;
	private int[] speeds = {25, 50, 75, 100, 125, 150, 175, 200};
	
	private Timer timer;
	private TimerTask task;
	
	private boolean running;
	
	@Override
	public void initialize(URL arg0, ResourceBundle arg1) {
		
		songs = new ArrayList<File>();
		
		directory = new File("music");
		
		files = directory.listFiles();
		
		if(files != null) {
			
			for(File file : files) {
				
				songs.add(file);
			}
		}
		
		media = new Media(songs.get(songNumber).toURI().toString());
		mediaPlayer = new MediaPlayer(media);
		
		songLabel.setText(songs.get(songNumber).getName());
		
		for(int i = 0; i < speeds.length; i++) {
			
			speedBox.getItems().add(Integer.toString(speeds[i])+"%");
		}
		
		speedBox.setOnAction(this::changeSpeed);
		
		volumeSlider.valueProperty().addListener(new ChangeListener<Number>() {

			@Override
			public void changed(ObservableValue<? extends Number> arg0, Number arg1, Number arg2) {
				
				mediaPlayer.setVolume(volumeSlider.getValue() * 0.01);			
			}
		});
		
		songProgressBar.setStyle("-fx-accent: #00FF00;");
	}

	public void playMedia() {
		
		beginTimer();
		changeSpeed(null);
		mediaPlayer.setVolume(volumeSlider.getValue() * 0.01);
		mediaPlayer.play();
	}
	
	public void pauseMedia() {
		
		cancelTimer();
		mediaPlayer.pause();
	}
	
	public void resetMedia() {
		
		songProgressBar.setProgress(0);
		mediaPlayer.seek(Duration.seconds(0));
	}
	
	public void previousMedia() {
		
		if(songNumber > 0) {
			
			songNumber--;
			
			mediaPlayer.stop();
			
			if(running) {
				
				cancelTimer();
			}
			
			media = new Media(songs.get(songNumber).toURI().toString());
			mediaPlayer = new MediaPlayer(media);
			
			songLabel.setText(songs.get(songNumber).getName());
			
			playMedia();
		}
		else {
			
			songNumber = songs.size() - 1;
			
			mediaPlayer.stop();
			
			if(running) {
				
				cancelTimer();
			}
			
			media = new Media(songs.get(songNumber).toURI().toString());
			mediaPlayer = new MediaPlayer(media);
			
			songLabel.setText(songs.get(songNumber).getName());
			
			playMedia();
		}
	}
	
	public void nextMedia() {
		
		if(songNumber < songs.size() - 1) {
			
			songNumber++;
			
			mediaPlayer.stop();
			
			if(running) {
				
				cancelTimer();
			}
			
			media = new Media(songs.get(songNumber).toURI().toString());
			mediaPlayer = new MediaPlayer(media);
			
			songLabel.setText(songs.get(songNumber).getName());
			
			playMedia();
		}
		else {
			
			songNumber = 0;
			
			mediaPlayer.stop();
			
			media = new Media(songs.get(songNumber).toURI().toString());
			mediaPlayer = new MediaPlayer(media);
			
			songLabel.setText(songs.get(songNumber).getName());
			
			playMedia();
		}
	}
	
	public void changeSpeed(ActionEvent event) {
		
		if(speedBox.getValue() == null) {
			
			mediaPlayer.setRate(1);
		}
		else {
			
			//mediaPlayer.setRate(Integer.parseInt(speedBox.getValue()) * 0.01);
			mediaPlayer.setRate(Integer.parseInt(speedBox.getValue().substring(0, speedBox.getValue().length() - 1)) * 0.01);
		}
	}
	
	public void beginTimer() {
		
		timer = new Timer();
		
		task = new TimerTask() {
			
			public void run() {
				
				running = true;
				double current = mediaPlayer.getCurrentTime().toSeconds();
				double end = media.getDuration().toSeconds();
				songProgressBar.setProgress(current/end);
				
				if(current/end == 1) {
					
					cancelTimer();
				}
			}
		};
		
		timer.scheduleAtFixedRate(task, 0, 1000);
	}
	
	public void cancelTimer() {
		
		running = false;
		timer.cancel();
	}
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ProgressBar?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane fx:id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="165.0" prefWidth="654.0" style="-fx-background-color: #222222;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.Controller">
   <children>
      <Label fx:id="songLabel" alignment="CENTER" layoutX="-1.0" prefHeight="100.0" prefWidth="655.0" text="MP3 Player" textFill="#00ff1a">
         <font>
            <Font size="65.0" />
         </font>
      </Label>
      <ProgressBar fx:id="songProgressBar" layoutX="-1.0" layoutY="99.0" prefHeight="18.0" prefWidth="655.0" progress="0.0" />
      <Button fx:id="playButton" layoutY="117.0" mnemonicParsing="false" onAction="#playMedia" prefHeight="46.0" prefWidth="85.0" text="PLAY">
         <font>
            <Font size="18.0" />
         </font>
      </Button>
      <Button fx:id="pauseButton" layoutX="85.0" layoutY="117.0" mnemonicParsing="false" onAction="#pauseMedia" prefHeight="46.0" prefWidth="85.0" text="PAUSE">
         <font>
            <Font size="18.0" />
         </font>
      </Button>
      <Button fx:id="resetButton" layoutX="170.0" layoutY="117.0" mnemonicParsing="false" onAction="#resetMedia" prefHeight="46.0" prefWidth="85.0" text="RESET">
         <font>
            <Font size="18.0" />
         </font>
      </Button>
      <Button fx:id="previousButton" layoutX="255.0" layoutY="117.0" mnemonicParsing="false" onAction="#previousMedia" prefHeight="46.0" prefWidth="85.0" text="PREVIOUS">
         <font>
            <Font size="13.0" />
         </font>
      </Button>
      <Button fx:id="nextButton" layoutX="340.0" layoutY="117.0" mnemonicParsing="false" onAction="#nextMedia" prefHeight="46.0" prefWidth="85.0" text="NEXT">
         <font>
            <Font size="13.0" />
         </font>
      </Button>
      <ComboBox fx:id="speedBox" layoutX="425.0" layoutY="117.0" onAction="#changeSpeed" prefHeight="46.0" prefWidth="79.0" promptText="SPEED" />
      <Slider fx:id="volumeSlider" layoutX="504.0" layoutY="133.0" max="100.0" prefHeight="14.0" prefWidth="149.0" value="50.0" />
   </children>
</AnchorPane>

package application;
	
import java.io.IOException;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
import javafx.scene.Parent;
import javafx.scene.Scene;

public class Main extends Application {
	
	@Override
	public void start(Stage stage) throws IOException {
       
		Parent root = FXMLLoader.load(getClass().getResource("Scene.fxml"));
		Scene scene = new Scene(root);
		stage.setScene(scene);
		stage.show();
		
		stage.setOnCloseRequest(new EventHandler<WindowEvent>() {

			@Override
			public void handle(WindowEvent arg0) {
				
				Platform.exit();
				System.exit(0);	
			}		
		});
	}	

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