The class javavariables.HasCollections has some Java lists, sets, and maps:

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public class HasCollections {

 public List list;

 public List<Thing> lThings; 

 public List<List<Thing>> lolThings;

 public List<String> lStrings;

 public Set<Thing> sThings = new HashSet<Thing>();

 public Map<String,Thing> map;
}

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Some of the collections use Java5 generics and can only deal in objects compatible with generics parameter.

Let's see first what happens on reverse if we select the option to Resolve collection generics ...