package device; public interface Device { void louder(); void quieter(); int getVolume(); void next(); void prev(); String play(); //get deviceName, Album and current Item String getInfoText(); //get a list of public methods String[] getOptions(); //get an Item of the Album String chooseItem(int itemNr); // get the actual album String[] getItemList(); //mute the Volume and returns an Info. String mute(); //unmute the Volume and returns an Info. String unmute(); }