small changes

src/TypeAdapter/PairAdapter.java

@@ -11,7 +11,9 @@ import com.google.gson.JsonPrimitive;
 import com.google.gson.JsonSerializationContext;
 import com.google.gson.JsonSerializer;
 
-import javafx.util.Pair;
+import classes.Pair;
+
+
 
 public class PairAdapter implements JsonSerializer<Pair<String, String>>, JsonDeserializer<Pair<String, String>>{
 

src/ui/model/Model.java

@@ -24,11 +24,12 @@ import classes.CpsEdge;
 import classes.CpsUpperNode;
 import classes.HolonElement;
 import classes.HolonSwitch;
+import classes.Pair;
 import classes.Position;
 import interfaces.CategoryListener;
 import interfaces.GraphListener;
 import interfaces.ObjectListener;
-import javafx.util.Pair;
+
 import ui.view.Console;
 import ui.view.DefaulTable;
 import ui.view.PropertyTable;