Update AnimalGame.java. Doing diagnostic 17.

16/AnimalGame.java

@@ -25,7 +25,19 @@ def play_until_exit():
             again = False
  */
  void play_until_exit() {
+    Scanner scanner = new Scanner(System.in)
+    boolean again = true;
+    while (again) {
+        play_animal_game();
+        System.out.print("Would you like to play again (y/n)?")
+        String input = scanner.nextLine() 
+        if (input.toLowerCase().startsWith("n")) {
+            System.out.println("Goodbye!");
+            again = false
+        }
+    }
 
+    scanner.close()
  }
  
  double play_5_times() {