BankDatabase.java

// BankDatabase.java
// Represents the bank account information database 

public class BankDatabase
{
   private Account accounts[]; // array of Accounts
   
   // no-argument BankDatabase constructor initializes accounts
   public BankDatabase()
   {
      accounts = new Account[10]; // 10 accounts

      accounts[0] = new Account(11111, 11111, 1000.35, 1000.35);
      accounts[1] = new Account(22222, 22222, 25234.50, 25234.50);
      accounts[2] = new Account(43121, 43121, 50000.75, 50000.75);
      accounts[3] = new Account(33333, 33333, 150000.90, 150000.90);
      accounts[4] = new Account(56425, 56425, 3000.20, 3000.20);
      accounts[5] = new Account(72343, 72343, 7500.10, 7500.10);
      accounts[6] = new Account(66535, 66535, 12000.80, 12000.80);
      accounts[7] = new Account(11451, 11451, 114514.60, 114514.60);
      accounts[8] = new Account(88888, 88888, 60833.95, 60833.95);
      accounts[9] = new Account(99999, 99999, 90350.45, 90350.45);
      
   } // end no-argument BankDatabase constructor
   
   // retrieve Account object containing specified account number
   private Account getAccount( int accountNumber )
   {
      // loop through accounts searching for matching account number
      for ( Account currentAccount : accounts )
      {
         // return current account if match found
         if ( currentAccount.getAccountNumber() == accountNumber )
            return currentAccount;
      } // end for

      return null; // if no matching account was found, return null
   } // end method getAccount

   // determine whether user-specified account number and PIN match
   // those of an account in the database
   public boolean authenticateUser( int userAccountNumber, int userPIN )
   {
      // attempt to retrieve the account with the account number
      Account userAccount = getAccount( userAccountNumber );

      // if account exists, return result of Account method validatePIN
      if ( userAccount != null )
         return userAccount.validatePIN( userPIN );
      else
         return false; // account number not found, so return false
   } // end method authenticateUser

   // return available balance of Account with specified account number
   public double getAvailableBalance( int userAccountNumber )
   {
      return getAccount( userAccountNumber ).getAvailableBalance();
   } // end method getAvailableBalance

   // return total balance of Account with specified account number
   public double getTotalBalance( int userAccountNumber )
   {
      return getAccount( userAccountNumber ).getTotalBalance();
   } // end method getTotalBalance

   // credit an amount to Account with specified account number
   public void credit( int userAccountNumber, double amount )
   {
      getAccount( userAccountNumber ).credit( amount );
   } // end method credit

   // debit an amount from of Account with specified account number
   public void debit( int userAccountNumber, double amount )
   {
      getAccount( userAccountNumber ).debit( amount );
   } // end method debit

    public boolean isValidAccount(int currentAccountNumber) 
   {
	   boolean isValid = false;
	   
	// loop through accounts searching for matching account number
	   for ( Account currentAccount : accounts )
	      {
	         // return current account if match found
	         if ( currentAccount.getAccountNumber() == currentAccountNumber ) {
	        	 isValid = true;
	         }
	        	 
	      }
	   return isValid;
	}
} // end class BankDatabase

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