抽象银行帐户

Question

我应该将BankAccount类中的monthlyProcess做为摘要。

我有一个父类BankAccount及其子类SavingsAccount。我把BankAccount类和它的monthlyProcess方法也做了抽象。我想我的问题是我不知道如何从SavingsAccount类中获取monthlyProcess方法来执行BankAccount类中的操作，因为我无法访问Savings类中所需的变量。

我尝试创建一个新的BankAccount构造函数，并将monthlyProcess方法内部的内容复制到新的构造函数中。

public abstract class BankAccount
{
    // Will hold the account balance
    private double accountBalance;
    // will hold the number of deposits made
    private int numberOfDeposits;
    // Will hold number of withdrawals made
    private int numberOfWithdrawals;
    // will hold the annual interest rate
    private double annualInterestRate;
    // will hold the amount of the monthly service charge
    private double monthlyServiceCharge;
    // will hold the monthly interest rate
    private double monthlyInterestRate;
    // Will hold the amount of monthly interest
private double monthlyInterest; 

    // Constructor accepts arguments for the balance and interest rate
    public BankAccount(double initialBalance, double interest)
    {
        accountBalance = initialBalance;

        annualInterestRate = interest;
    }

    public BankAccount()
    {
        accountBalance = accountBalance - monthlyServiceCharge;

        calcInterest();

        numberOfWithdrawals = 0;


        numberOfDeposits = 0;

        monthlyServiceCharge = 0;
    }
    // Method will add the argument it take to the accountBalance variable
    // The number of deposits is incremented
    public void deposit(double deposit)
    {
        accountBalance += deposit;

        numberOfDeposits++;
    }

    // The argument taken will be substracted form the account balance
    // The number of withdrawals is also incremented
    public void withdraw(double withdraw)
    {
        accountBalance -= withdraw;

        numberOfWithdrawals++;
    }

    // Method which determines the interest calculations
    public void calcInterest()
    {
        // Calculation for monthly interest rate
        monthlyInterestRate = (annualInterestRate / 12);

        //Calculation for monthly interst
        monthlyInterest = accountBalance * monthlyInterestRate;

        // Will hold the balance of the account added to the monthly interest
        accountBalance = accountBalance + monthlyInterest;
    }

    public abstract void monthlyProcess();
    /*// Method which determines amount how much interest is owed on account
    public void monthlyProcess()
    {
        accountBalance = accountBalance - monthlyServiceCharge;

        calcInterest();

        numberOfWithdrawals = 0;


        numberOfDeposits = 0;

        monthlyServiceCharge = 0;
    }*/

    //Returns number of withdrawals made
    public int getNumberOfWithdrawals()
    {
        return numberOfWithdrawals;
    }

    // Returns number of deposits made
    public int getNumberOfDeposits()
    {
        return numberOfDeposits;
    }

    public void setMonthlyServiceCharge(double charge)
    {
        monthlyServiceCharge = charge;
    }

    //returns monthly service charge
    public double getMonthlyServiceCharge()
    {
        return monthlyServiceCharge;
    }

    // Returns account balance
    public double getBalance()
    {
        return accountBalance;
    }
}
````
// SavingsAccount will inhert from BankAccount
public class SavingsAccount extends BankAccount
{
    // boolean variable will be used to determine if account is active
    private boolean status = true;

    // Constrcutor will take an argument for the account balance and interest rate
    public SavingsAccount(double initialBalance, double interest)
    {
        // Will inherit contructor from BankAccount class
        super(initialBalance, interest);

        // If statement used to determine if account is active
        if(initialBalance < 25)
        {
            status = false;
        }
    }

    // Withdraw methof will take away from the bank account balance
    // if the balance falls below 25, the account is inactive
    public void withdraw(double amount)
    {
        // If statement will determine if the active in order to withdraw
        if(getBalance() < 25)
        {
            status = false;

            System.out.println("Account Inactive: No Withdrawals can be made. ");
        }
        else
        {
            super.withdraw(amount);
        }
    }

    // The deposit method will be used to add funds into the account.
    // Once the account balance is above 25, it becomes active
    public void deposit(double deposit)
    {
        // Determines if account is inactive or active after a deposit has been made
        if(getBalance() < 25)
        {
            status = false;
        }
        else if(getBalance() > 25)
        {
            status = true;
        }

        // Calling the superclass version of the deposit method
        super.deposit(deposit);
    }

    // Method will charge the service fee for having more than four withdrawals 
    public void monthlyProcess()
    {

        // If statement will be used to charge the account for having more than 4 withdrawals 
        if(getNumberOfWithdrawals() > 4)
        {
            setMonthlyServiceCharge((getMonthlyServiceCharge() + getNumberOfWithdrawals()) -4);
        }

        // Calling the superclass version of the monthlyProcess method
        //super.monthlyProcess();



        // will check to see if account is inactive
        if(getBalance() < 25)
        {
            status = false;
        }

        //new SavingsAccount(new(BankAccount));
    }
}