Çàäà÷à . 37105

public class BankAccount
{
 private double balance;
 public BankAccount()
  { balance = 0; }
 public BankAccount(double acctBalance)
  { balance = acctBalance; }
 public void deposit(double amount)
  { balance += amount; }
 public void withdraw(double amount)
  { balance -= amount; }
 public double getBalance()
  { return balance; }
}
public class SavingsAccount extends BankAccount
{
 private double interestRate;
 public SavingsAccount()
  { /* implementation not shown */ }
 public SavingsAccount(double acctBalance, double rate)
  { /* implementation not shown */ }
 public void addInterest() //Add interest to balance
  { /* implementation not shown */ }
}
public class CheckingAccount extends BankAccount
{
 private static final double FEE = 2.0;
 private static final double MIN_BALANCE = 50.0;
 public CheckingAccount(double acctBalance)
  { /* implementation not shown */ }
/** FEE of $2 deducted if withdrawal leaves balance less
* than MIN_BALANCE. Allows for negative balance. */
 public void withdraw(double amount)
  { /* implementation not shown */ }
}

/** Transfer amount from this BankAccount to another BankAccount.
* Precondition: balance > amount
* @param another a different BankAccount object
* @param amount the amount to be transferred
*/
public void transfer(BankAccount another, double amount)
{
 withdraw(amount);
 another.deposit(amount);
}

BankAccount b = new BankAccount(650);
SavingsAccount timsSavings = new SavingsAccount(1500, 0.03);
CheckingAccount daynasChecking = new CheckingAccount(2000);