[Soot-list] how to get the subclass from a super class (or an interface)

[aiwu shi]

hi, 
    I want to get the subclass from a super class (or an interface), where subclass of an interface mean the class implementing the interface. how to do that ? 
     
      for example, 
                SootClass sc=Scene.v().loadClassAndSupport("java.util.List");
      
       I want to get the subclass for sc, i.e.,    AbstractList, LinkedList.
    supposed that both of above classes are not in Scene, we can not use Hierachy/FastHierachy.

              how to get that from soot API or Java API?

      thanks
         Aiwu Shi
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