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  1. public class BankDatabase
  2. {
  3.     private Account[] accounts;
  4.    
  5.     public BankDatabase()
  6.     {
  7.         accounts = new Account[2];
  8.         accounts[0] = new Account(12345, 54321, 1000000, 1200000);
  9.         accounts[1] = new Account(98765, 56789, 200000, 200000);
  10.     }
  11.    
  12.     private Account getAccount(int accountNumber)
  13.     {
  14.         for(Account currentAccount : accounts)
  15.         {
  16.             if(currentAccount.getAccountNumber() == accountNumber)
  17.                 return currentAccount;
  18.         }
  19.         return null;
  20.     }
  21.    
  22.     public boolean authenticateUser(int userAccountNumber, int userPIN)
  23.     {
  24.         Account userAccount = getAccount(userAccountNumber);
  25.         if(userAccount != null)
  26.             return userAccount.validatePIN(userPIN);
  27.         else
  28.             return false;
  29.     }
  30.    
  31.     public double getAvailableBalance(int userAccountNumber)
  32.     {
  33.         return getAccount(userAccountNumber).getAvailableBalance();
  34.     }
  35.    
  36.     public double getTotalBalance(int userAccountNumber)
  37.     {
  38.         return getAccount(userAccountNumber).getTotalBalance();
  39.     }
  40.    
  41.     public void credit(int userAccountNumber, double amount)
  42.     {
  43.         getAccount(userAccountNumber).credit(amount);
  44.     }
  45.    
  46.     public void debit(int userAccountNumber, double amount)
  47.     {
  48.         getAccount(userAccountNumber).debit(amount);
  49.     }
  50. }
');