Bulk operations on sets/ map problem

Quote:

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• For each band stored in allBands create an entry in bandFans with the band
name as key and a new empty set as its value.

• For each person in allPeople

o For each band in that person’s personInterests

add the person to the set which is the value of that band in
bandFans.

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The first two points are working okay (I think) but I just can't seem to figure out how to add the all names into the set (only one currently). This is my code so far:

Code :

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   public void workOutBandFans()
   {
      Set<String>peopleSet = new HashSet<String>();
      for (String band : allBands)
      {
       bandFans.put(band, new HashSet<String>());
      }
      for (String person : allPeople)
      {
         for (String band : personInterests.get(person))
         {
            peopleSet.add(person);
            bandFans.put(band, peopleSet);
 
         }
 
         peopleSet = new HashSet<String>();
      }

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