合計金額算出メソッド、合計レンタルポイント算出メソッドをRentalsクラスに移動

src/main/java/video/domain/Customer.java

@@ -24,28 +24,11 @@ public Rentals getRentals() {
     }
 
     public RentalResult rentalMovies() {
-        int totalAmount = totalAmount();
+        int totalAmount = rentals.totalAmount();
 
-        int frequentRenterPoints = frequentRenterPoints();
+        int frequentRenterPoints = rentals.totalFrequentRenterPoints();
 
         return new RentalResult(totalAmount, frequentRenterPoints);
     }
 
-    private int frequentRenterPoints() {
-        int frequentRenterPoints = 0;
-        for (Rental each : rentals.list()) {
-            frequentRenterPoints += each.frequentRenterPoints();
-        }
-        return frequentRenterPoints;
-    }
-
-    private int totalAmount() {
-        int totalAmount = 0;
-        for (Rental each : rentals.list()) {
-            int thisAmount = each.amount();
-            totalAmount += thisAmount;
-        }
-        return totalAmount;
-    }
-
 }

src/main/java/video/domain/rental/Rentals.java

@@ -13,4 +13,21 @@ public void add(Rental rental) {
     public List<Rental> list() {
         return list;
     }
+
+    public int totalAmount() {
+        int totalAmount = 0;
+        for (Rental each : list()) {
+            int thisAmount = each.amount();
+            totalAmount += thisAmount;
+        }
+        return totalAmount;
+    }
+
+    public int totalFrequentRenterPoints() {
+        int frequentRenterPoints = 0;
+        for (Rental each : list()) {
+            frequentRenterPoints += each.frequentRenterPoints();
+        }
+        return frequentRenterPoints;
+    }
 }