public class Account
{
    private int accountNumber;      // account number
    private int pin;        // PIN for authentication
    private double availableBalance;    // funds available for withdrawal
    private double totalBalance;        // funds available + pending deposits

    // Account constructor initializes attributes
    public Account(int theAccountNumber, int thePIN, double theAvailableBalance, double theTotalBalance){
        accountNumber = theAccountNumber;
        pin = thePIN;
        availableBalance = theAvailableBalance;
        totalBalance = theTotalBalance;
    }   // end Account constructor

    // determines whether a user-specified PIN matches PIN in Account
    public boolean validatePIN(int userPIN){
        if(userPIN == pin){
            return true;    // means the PIN input is match with the user's PIN
        }
        else{
            return false;   // means the PIN input is not match with the user's PIN
        }
    }   // end method validatePIN

    // returns available balance
    public double getAvailableBalance(){
        return availableBalance;
    }

    // returns the total balance
    public double getTotalBalance(){
        return totalBalance;
    }

    // credits an amount to the account
    public void credit(double amount){
        totalBalance += amount;     // add to total balance
    }

    // debits an amount from the account
    public void debit(double amount){
        availableBalance -= amount;     // substract from available balance
        totalBalance -= amount;         // substract from total balance
    }

    // returns account number
    public int getAccountNumber(){
        return accountNumber;
    }
}   // end class Account