1   // joi/7/bank/SavingsAccount.java
2   //
3   //
4   // Copyright 2003 Bill Campbell and Ethan Bolker
5   
6   /**
7    * A SavingsAccount is a BankAccount that bears interest.
8    * A fee is charged for too many transactions in a month.
9    *
10   * @see BankAccount
11   *
12   * @version 7
13   */
14  
15  public class SavingsAccount extends BankAccount 
16  {
17      private int transactionsThisMonth;
18  
19      /**
20       * Override getTransactionFee() to return a non-zero fee
21       * after the appropriate number of free monthly transactions.
22       *
23       * @return the fee for current transaction.
24       */
25  
26      protected int getTransactionFee()
27      {
28          if (transactionsThisMonth > 
29              getIssuingBank().getMaxFreeTransactions()) {
30              return getIssuingBank().getTransactionFee();
31          }
32          else {
33              return 0;
34          }
35      }
36      
37      /**
38       * Increment count of transactions, for this account for
39       * this Month and in total  and for the issuing Bank, by one. 
40       *
41       * @exception InsufficientFundsException when appropriate.
42       */
43  
44      public void countTransaction()
45          throws InsufficientFundsException
46      {
47          transactionsThisMonth++;
48          super.countTransaction();
49      }
50  
51      /**
52       * Constructor, accepting an initial balance.  
53       * @param initialBalance the opening balance.
54       *
55       * @param issuingBank the bank that issued this account.
56       *
57       * @exception InsufficientFundsException when appropriate.
58       */
59  
60      public SavingsAccount( int initialBalance, Bank issuingBank ) 
61           throws InsufficientFundsException
62      {
63          super( initialBalance, issuingBank);
64          transactionsThisMonth = 1;
65      }
66  
67      /**
68       * A SavingsAccount earns interest each month.
69       *
70       * @exception InsufficientFundsException when appropriate.
71       */
72  
73      public void newMonth() 
74           throws InsufficientFundsException
75      {
76          double monthlyRate = getIssuingBank().getInterestRate()/12; 
77          incrementBalance( (int)(monthlyRate * getBalance()));
78          transactionsThisMonth = 0;
79      }
80  }
81