CheckingAccount, C#

CheckingAccount

/**
   A checking account that charges transaction fees.
*/
public class CheckingAccount:BankAccount 
{  
   //Overrides the toString method in Object class
   public string ToString()
   {
        return   base.ToString() + "[transactionCount= " + transactionCount + "]";
   }

//Overrides the compareTo method in the super BankAccount class 
   public int CompareTo(object anObject)
   {
          if (anObject is SavingsAccount) 
              return 1;
          else          
              return base.CompareTo(anObject);
   }

/**
      Constructs a checking account with a given balance.
   */
   public CheckingAccount(double initialBalance)
   {  
      // Construct superclass
      base (initialBalance);
      
      // Initialize transaction count
      transactionCount = 0; 
   }

public override deposit(double amount) 
   {  
      transactionCount++;
      // Now add amount to balance 
      base.deposit(amount); 
   }
   
   public override withdraw(double amount) 
   {  
      transactionCount++;
      // Now subtract amount from balance 
      base.withdraw(amount); 
   }

/**
      Deducts the accumulated fees and resets the
      transaction count.
   */
   public override deductFees()
   {  
      if (transactionCount > FREE_TRANSACTIONS)
      {  
         double fees = TRANSACTION_FEE *
               (transactionCount - FREE_TRANSACTIONS);
         base.withdraw(fees);
      }
      transactionCount = 0;
   }

private int transactionCount;

private static final int FREE_TRANSACTIONS = 3;
   private static final double TRANSACTION_FEE = 2.0;
}


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