Demonstration of using multiple interfaces to play or stop music with the help of Processing Sound library

playMusicWithMultipleInterfaces.pde

import processing.sound.*;

interface Class1 {
  void playSong();
  void stopSong();
}

interface Class2 {
  void playSong();
  void stopSong();
}

class Song1 implements Class1 {
  SoundFile file;
  String path = sketchPath("sample1.mp3");
  Song1(PApplet applet) {
    file = new SoundFile(applet, path);
  }
  void playSong() {
    file.play();
  }
  void stopSong() {
    file.stop();
  }
}

class Song2 implements Class2 {
  SoundFile file;
  String path = sketchPath("sample2.mp3");
  Song2(PApplet applet) {
    file = new SoundFile(applet, path);
  }
  void playSong() {
    file.play();
  }
  void stopSong() {
    file.stop();
  }
}

//runs once when the app first starts
void setup() {
  // first play the first song
  // wait for 10 secs
  // then we stop the first song and start playing the second song
  // wait for 5 secs
  // then we stop the second song
  Song1 s1 = new Song1(this);
  s1.playSong();
  delay(10000);
  s1.stopSong();
  Song2 s2 = new Song2(this);
  s2.playSong();
  delay(5000);
  s2.stopSong();
}

//runs all the time, this is the main app loop
void draw() {
}

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