Update Accounts.java

training-assignments/src/java/eu/sig/training/ch04-duplication/bankaccounts/Accounts.java

@@ -1,20 +1,27 @@
-package eu.sig.training.ch04;
+package eu.sig.training.ch04.v4;
 
-public class Accounts {
-    @SuppressWarnings("unused")
-    public static CheckingAccount findAcctByNumber(String number) {
-        return new CheckingAccount();
-    public static SavingsAccount findAcctByNumber(String number) {
-        return new SavingsAccount();
+import eu.sig.training.ch04.BusinessException;
+import eu.sig.training.ch04.Money;
+import eu.sig.training.ch04.v3.CheckingAccount;
+
+// tag::Account[]
+public class Account {
+    public Transfer makeTransfer(String counterAccount, Money amount)
+        throws BusinessException {
+        if (isValid(counterAccount)) {
+            CheckingAccount acct = Accounts.findAcctByNumber(counterAccount);
+            return new Transfer(this, acct, amount);
+        } else {
+            throw new BusinessException("Invalid account number!");
+        }
     }
 
-    // tag::isValid[]
     public static boolean isValid(String number) {
         int sum = 0;
         for (int i = 0; i < number.length(); i++) {
             sum = sum + (9 - i) * Character.getNumericValue(number.charAt(i));
         }
         return sum % 11 == 0;
     }
-    // end::isValid[]
 }
+// end::Account[]