creato rmi counter. verifica blanda di errori di input

rmi_counter/CounterInterface.java

@@ -0,0 +1,15 @@
+package rmi_counter;
+
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+/**
+ * Created by Giovanni on 16/11/2014.
+ */
+public interface CounterInterface extends Remote{
+
+    int getvalue (String from) throws RemoteException;
+    int sum (String from, int value) throws RemoteException;
+
+
+}