diff --git a/src/Museo/FiltroStringa.java b/src/Museo/FiltroStringa.java
deleted file mode 100644
index 63d292c..0000000
--- a/src/Museo/FiltroStringa.java
+++ /dev/null
@@ -1,44 +0,0 @@
-public interface FiltroStringa{
-    String getString(Object obj);
-}
-
-class FiltroSupporto implements FiltroStringa{
-
-    public String getString(Object obj){
-        if(obj instanceof OperaMult)
-            return ((OperaMult) obj).getSupporto();
-        else
-            return "";
-    }
-}
-
-class FiltroTecnica implements FiltroStringa{
-
-    public String getString(Object obj){
-        if(obj instanceof Stampa)
-            return ((Stampa) obj).getTecnica();
-        else
-            return "";
-    }
-}
-
-class FiltroAutore implements FiltroStringa{
-    
-    public String getString(Object obj){
-        return ((Opera) obj).getAutore();
-    }
-}
-
-class FiltroTitolo implements FiltroStringa{
-    
-    public String getString(Object obj){
-        return ((Opera) obj).getTitolo();
-    }
-}
-
-class FiltroPosizione implements FiltroStringa{
-
-    public String getString(Object obj){
-        return ((Opera) obj).getPos();
-    }
-}
\ No newline at end of file