diff --git a/src/Cassa/Cassa.class b/src/Cassa/Cassa.class
new file mode 100644
index 0000000..21f550c
Binary files /dev/null and b/src/Cassa/Cassa.class differ
diff --git a/src/Cassa/Cassa.java b/src/Cassa/Cassa.java
new file mode 100644
index 0000000..ca489a3
--- /dev/null
+++ b/src/Cassa/Cassa.java
@@ -0,0 +1,12 @@
+public class Cassa{
+
+    public Cassa(){
+        cassa=0;
+    }
+
+    public int resto(int costo, int contante){
+        return contante - costo;
+    }
+
+    int cassa;
+}
diff --git a/src/JoptionPane/Ese1.class b/src/JOptionPane/Ese1.class
similarity index 100%
rename from src/JoptionPane/Ese1.class
rename to src/JOptionPane/Ese1.class
diff --git a/src/JoptionPane/Ese1.java b/src/JOptionPane/Ese1.java
similarity index 100%
rename from src/JoptionPane/Ese1.java
rename to src/JOptionPane/Ese1.java
diff --git a/src/JoptionPane/Ese2.class b/src/JOptionPane/Ese2.class
similarity index 100%
rename from src/JoptionPane/Ese2.class
rename to src/JOptionPane/Ese2.class
diff --git a/src/JoptionPane/Ese2.java b/src/JOptionPane/Ese2.java
similarity index 100%
rename from src/JoptionPane/Ese2.java
rename to src/JOptionPane/Ese2.java
diff --git a/src/JoptionPane/Esercizio1.class b/src/JOptionPane/Esercizio1.class
similarity index 100%
rename from src/JoptionPane/Esercizio1.class
rename to src/JOptionPane/Esercizio1.class
diff --git a/src/JoptionPane/Esercizio1.java b/src/JOptionPane/Esercizio1.java
similarity index 100%
rename from src/JoptionPane/Esercizio1.java
rename to src/JOptionPane/Esercizio1.java