Java UML correction -


i solved uml diagram in java not sure totally correct. , want know should add or remove program.

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    interface playaudio { // playaudio interface     void playa(int id); }      interface playvideo { // playvideo interface     void playv(int id);     }      class electronicdevice { // electronicdevice class     boolean started;      public void start() {         if (!started) {             started = true;             system.out.println("the device started playing.");         }     }      public void stop() {         if (started) {             started = false;             system.out.println("the device stopped playing.");         }     }     }  class dvdplayer extends electronicdevice implements playvideo, playaudio { //    dvdplayer                                                                             //  class     public string devicetype;      dvdplayer(string devicetype) { // constructor         this.devicetype = devicetype;     }      public void start() {         system.out.println("the " + devicetype + " started playing.");     }      public void stop() {         system.out.println("the " + devicetype + " stopped playing.");     }      public void playv(int id) {         system.out.println("the " + devicetype + " playing video stream no. " + id + ".");     }      public void playa(int id) {         system.out.println("the " + devicetype + " playing audio track no. " + id + ".");     } }      class mp3player extends electronicdevice implements playaudio { // mp3player                                                                 // class     public string devicetype;      mp3player(string devicetype) { // constructor         this.devicetype = devicetype;     }      public void start() {         system.out.println("the " + devicetype + " started playing.");     }      public void stop() {         system.out.println("the " + devicetype + " stopped playing.");     }      public void playa(int id) {         system.out.println("the " + devicetype + " playing audio track no. " + id + ".");     } }      public class testbench {      public static void testaudio(playaudio a) {         a.playa(0); // have put 0 id because testing audio                     // device, see if works     }      public static void testvideo(playvideo v) {         v.playv(0);     }      public static void teststart(electronicdevice e) {         e.start();     }      public static void teststop(electronicdevice e) {         e.stop();     }      public static void main(string[] args) { // main method         mp3player m = new mp3player("ipod");         m.start();         m.playa(5);          playaudio = new mp3player("walkman");         testaudio(a);          electronicdevice ed = new dvdplayer("dolby digital");         teststart(ed);         ((playvideo) ed).playv(6);      }      }

ps : okay how started exercise ? or should start in way coding uml?


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