// Accounts2 example -- Lowis & Loftus 1st edition, page 306.

class BankAccount {

   protected int account;
   protected double balance;

   public BankAccount (int accountNum, double initBalance) {

   account = accountNum;
   balance = initBalance;
   }

   public void deposit (double amount) {

      balance += amount;
      System.out.println ("Deposit into account " + account);
      System.out.println ("Amount: " + amount);
      System.out.println ("New balance: " + balance);
      System.out.println();
   }

   public boolean withdrawal (double amount) {

      boolean result = false;
      System.out.println ("Withdrawal from account " + account);
      System.out.println ("Amount: " + amount);
      if (amount > balance)
         System.out.println ("Insufficient funds.");
      else {
         balance -=amount;
         System.out.println ("New balance: " + balance);
         result = true;
      }
      System.out.println();
      return result;
   }
}

class CheckingAccount extends BankAccount {

   private SavingsAccount overdraft;

   public CheckingAccount (int accountNum, double initBalance,
                           SavingsAccount protection) {

   super (accountNum, initBalance);
   overdraft = protection;
   }

   public boolean withdrawal (double amount) {

     boolean result = false;

     if (! super.withdrawal (amount)) {
        System.out.println ("Using overdraft...");
        if (! overdraft.withdrawal (amount - balance)) 
           System.out.println ("Overdraft source insufficient.");
        else {
           balance = 0;
           System.out.println ("New balance on account " + 
                               account + ": " + balance);
           result = true;
             }
     }
     System.out.println ();
     return result;
   }
}


class SavingsAccount extends BankAccount {

   protected double rate;

   public SavingsAccount (int accountNum, double initBalance,
                          double intRate) {

   super (accountNum, initBalance);
   rate = intRate;
   }

   public void addInterest () {
      balance += balance * rate;
      System.out.println ("Interest added to account " + account);
      System.out.println ("New balance: " + balance);
      System.out.println();
   }
}

class BonusSaver extends SavingsAccount {

   private final int PENALTY = 25;
   private final double BONUS_RATE = 0.03;

   public BonusSaver (int accountNum, double initBalance,
                          double intRate) {
      super (accountNum, initBalance, intRate);
   }

   public boolean withdrawal (double amount) {
      System.out.println ("Penalty incurred: " + PENALTY);
      return super.withdrawal (amount + PENALTY);
   }

   public void addInterest () {
      balance += balance * (rate + BONUS_RATE);
      System.out.println ("Interest added to account " + account);
      System.out.println ("New balance: " + balance);
      System.out.println();
   }
}

class Accounts2 {

   public static void main (String[] args) {

      SavingsAccount savings = new SavingsAccount 
                                 (4321, 8921.39, 0.02);
      BonusSaver bigSavings = new BonusSaver (6543, 1234.00, 0.02);
      CheckingAccount checking = new CheckingAccount (7890, 345.66, savings);

      savings.deposit (456.09);
      bigSavings.deposit (456.09);

      savings.withdrawal (555.99);
      bigSavings.withdrawal (666.88);

      checking.withdrawal (555.98);
   }
}