public final class Volume implements Comparable {
   public static final int SILENT_LEVEL   = 0;
   public static final int SOFT_LEVEL   = 1;
   public static final int AUDIBLE_LEVEL = 2;
   public static final int LOUD_LEVEL   = 3;
   public static final int ELEVEN_LEVEL   = 4;

   public static final Volume SILENT   = new Volume(SILENT_LEVEL);
   public static final Volume SOFT   = new Volume(SOFT_LEVEL);
   public static final Volume AUDIBLE = new Volume(AUDIBLE_LEVEL);
   public static final Volume LOUD   = new Volume(LOUD_LEVEL);
   public static final Volume ELEVEN   = new Volume(ELEVEN_LEVEL);

   private static final Volume __VOLUMES[] = {
      SILENT, SOFT, AUDIBLE, LOUD, ELEVEN
   };

   private int __level;

   public static final Volume getVolume(int level) {
      if(level >= SILENT_LEVEL && level <= ELEVEN_LEVEL)
      return __VOLUMES[level];
      return null;
   }

   private Volume(int level) {
      __level = level;
   }

   public boolean equals(Object obj) {
      // Assume proper type was given
      return (__level == ((Volume)obj).__level);
   }

   public int compareTo(Object obj) {
      // Assume proper type was given
      int other = ((Volume)obj).__level;
      if(__level == other)
      return 0;
      if(__level < other)
      return -1;
      return 1;
   }

   public int getLevel() { return __level; }
}