Fix NextPosizioneLibera e main

src/eserciziogarage/EsercizioGarage.java

@@ -39,15 +39,15 @@ public class EsercizioGarage {
                 case 0:
                     break;
                 case 1:
-                    garage.IngressoAuto();
+                    System.out.println(garage.IngressoAuto());
                     Pausa();
                     break;
                 case 2:
-                    garage.GetPostiOccupati();
+                    System.out.println(garage.GetPostiOccupati());
                     Pausa();
                     break;
                 case 3:
-                    garage.GetPostiLiberi();
+                    System.out.println(garage.GetPostiLiberi());
                     Pausa();
                     break;
                 case 4:

src/eserciziogarage/Garage.java

@@ -21,11 +21,9 @@ public class Garage {
     
     private int NextPosizioneLibera() {
         boolean exit = true;
-        int i = 0;
+        int i = -1;
-        for (; i < this.veicoli.length && exit; i++) {
+        for (; i < this.veicoli.length && this.veicoli[i] != null; ++i) {
-            if (this.veicoli[i] == null) {
+            ;
-                exit = false;
-            }
         }
         return i;
     }