What is the difference between Java and JavaFX?

4 Replies to “What is the difference between Java and JavaFX?”

1. Is there a way to use the functions provided by the javafx libraries to use in an existing regular, console based Java application? For instance in my console app i need to add sound from mp3 which i have to start playing on an arbitrary position in the file.

   1. You can use Swing in JavaFX and JavaFX in Swing. In theory you can run Swing in Headless mode and access it via Swing.

      1. Why using Swing? I did some tests but have troubles with static MediaPlayer object:

         
package be.saleconix;

         import java.net.URL;
import java.util.concurrent.CountDownLatch;

         import javafx.application.Application;
import javafx.embed.swing.JFXPanel;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;
import javafx.util.Duration;

         class AudioPlayer {
URL resource;
Media media;
static MediaPlayer mediaPlayer;

         public AudioPlayer(String filename) throws NullPointerException, InterruptedException {
new JFXPanel(); // initializes JavaFX environment
this.resource = getClass().getResource("/" + filename);
this.media = new Media(resource.toString());
this.mediaPlayer = new MediaPlayer(media);
}

         void play() {
mediaPlayer.setOnReady(()->{
mediaPlayer.play();
});
}

         void stop() {
mediaPlayer.stop();
}

         void playPosition(double position) {

         mediaPlayer.setStartTime(Duration.millis(position));
mediaPlayer.setOnStopped(()->{
mediaPlayer.play();
});
mediaPlayer.stop();
//mediaPlayer.setOnReady(()->{

         //});
}

         }

         public class Main {
public static void main(String[] args) {
try {
AudioPlayer audioPlayerA = new AudioPlayer("test.mp3");
System.out.println("Play the media.");
audioPlayerA.play();
System.out.println("Waiting 5s ...");
Thread.sleep(5000);
// System.out.println("Play the media.");
// AudioPlayer audioPlayerB = new AudioPlayer("test1.mp3");
// audioPlayerB.play();
System.out.println("Now playing at 10s");
audioPlayerA.playPosition(10000);
System.out.println("Waiting 5s ...");
Thread.sleep(5000);
System.out.println("Stopping");
audioPlayerA.stop();
} catch (NullPointerException e) {
System.out.println("Cannot create audio player, check filename.");
} catch (InterruptedException e) {
System.out.println("Thread interrupted: " + e);
}
}
}


2. This is a working demo:
   
package be.saleconix;

   import java.net.URL;

   import com.sun.javafx.application.PlatformImpl;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.util.Duration;

   class AudioPlayer implements Runnable {
private URL resource;
private Media media;
private MediaPlayer mediaPlayer;
private boolean ready = false;
private Thread t;
private String threadname;
private static Integer numberOfActiveThreads = 0;

   /**
* Start a mediaplayer thread
* @param filename
* @param threadname
* @throws NullPointerException
* @throws InterruptedException
*/
public AudioPlayer(String filename, String threadname) throws NullPointerException, InterruptedException {
if (numberOfActiveThreads == 0) {
PlatformImpl.startup(()->{}); // initialize JavaFX environment
System.out.println("The JavaFX environment has been started");
}
this.threadname = threadname;
resource = getClass().getResource("/" + filename);
media = new Media(resource.toString());
t = new Thread(this, threadname);
t.start();
numberOfActiveThreads ++;
}

   public void run() {
mediaPlayer = new MediaPlayer(media);
mediaPlayer.setOnReady(() -> { // register a callback and let it deregister itself after execution
System.out.println("The mediaplayer [" + threadname + "] has been started");
ready = true;
mediaPlayer.setOnReady(null);
});
while (!t.isInterrupted());
System.out.println("The mediaplayer [" + threadname + "] has been terminated");
}

   String getThreadname() {
return threadname;
}

   /**
* Plays the sound from the start
* @throws InterruptedException
*/
void play() throws InterruptedException {
play(0);
}

   /**
* Plays the sound at a specific position in ms
* @throws InterruptedException
* @throws IllegalThreadStateException
*/
void play(double position) throws InterruptedException, IllegalThreadStateException {
int i = 500;
while (!ready && i > 0) {
Thread.sleep(1);
i--;
}
if (i > 0) {
mediaPlayer.setStartTime(Duration.millis(position));
if (mediaPlayer.getStatus() == MediaPlayer.Status.PLAYING) {
mediaPlayer.setOnStopped(()->{
mediaPlayer.play();
mediaPlayer.setOnStopped(null);
});
mediaPlayer.stop();
} else {
mediaPlayer.play();
}
} else {
throw new IllegalThreadStateException("The mediaplayer is not ready after 500ms timeout");
}
}

   /**
* Stop the mediaplayer thread
*/
void stop() {
mediaPlayer.setOnReady(null);
mediaPlayer.setOnStopped(null);
mediaPlayer.stop();
numberOfActiveThreads --;
t.interrupt();
if (numberOfActiveThreads == 0) {
PlatformImpl.exit(); // exit the JavaFX environment
System.out.println("The JavaFX environment has been exited");
}
}

   }

   public class Main {
public static void main(String[] args) {
try {
AudioPlayer audioPlayerA = new AudioPlayer("test.mp3", "audioplayerA");

   System.out.println("Play audioplayerA from start");
audioPlayerA.play();

   System.out.println("Waiting 10s ...");
Thread.sleep(10000);

   System.out.println("Play audioplayerA at position 20s");
audioPlayerA.play(20000);

   System.out.println("Waiting 5s ...");
Thread.sleep(5000);

   AudioPlayer audioPlayerB = new AudioPlayer("test1.mp3", "audioplayerB");

   System.out.println("Play audioplayerB from start.");
audioPlayerB.play();

   System.out.println("Waiting 20s ...");
Thread.sleep(20000);

   System.out.println("Stopping audioplayerA");
audioPlayerA.stop();

   System.out.println("Stopping audioplayerB");
audioPlayerB.stop();

   } catch (NullPointerException e) {
System.out.println("Cannot create audio player, check filename.");
} catch (InterruptedException e) {
System.out.println("Thread interrupted: " + e);
} finally {
System.out.println("Main thread has been exited");
}
}
}


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