Fixed bugs.

src/main/ui/Main.java

@@ -15,6 +15,7 @@ public class Main {
         //options = new Options();
         System.out.println("Welcome to " + PROGRAM_NAME + "!");
         guess();
+        end();
     }
 
     // java main
@@ -40,8 +41,16 @@ public class Main {
 
     public int getUserInt() {
         Scanner scan = new Scanner(System.in);
-        int result = scan.nextInt();
-        scan.close();
+        int result = 0;
+        while (true) {
+            if (scan.hasNextInt()) {
+                result = scan.nextInt();
+                break;
+            } else {
+                System.out.println("Try again?");
+                scan.nextLine();
+            }
+        }
         return result;
     }
 
@@ -49,18 +58,18 @@ public class Main {
         if (user < secret || user > secret) {
             this.games++;
             System.out.println("Too bad. You guessed " 
-                                + secret + " with " + user + ".");
+                    + secret + " with " + user + ".");
         } else {
             this.games++;
             this.win++;
             System.out.println("Wonderful! You have correctly guessed: " 
-                                + secret + " with " + user + "!");
+                    + secret + " with " + user + "!");
         }
     }
 
     public void end() {
         System.out.println("You have won: " + this.win + " out of " + this.games
-                            + "!");
+                + "!");
         System.out.println("Thank you for playing this game! Bye!");
     }
 }