这是我的代码。 主要SavingsDemo.java
public class SavingsDemo
{
public static void main(String[] args)
{
// Create a SavingsAccount object with a $100 balance,
// 3% interest rate, and a monthly service charge
// of $2.50.
SavingsAccount savings =
new SavingsAccount(100.0, 0.03, 2.50);
// Display what we've got.
System.out.printf("Balance: $%,.2f\n",
savings.getBalance());
System.out.println("Number of deposits: " +
savings.getNumDeposits());
System.out.println("Number of withdrawals: " +
savings.getNumWithdrawals());
System.out.println();
// Make some deposits.
savings.deposit(25.00);
savings.deposit(10.00);
savings.deposit(35.00);
// Display what we've done so far.
System.out.printf("Balance: $%,.2f\n",
savings.getBalance());
System.out.println("Number of deposits: " +
savings.getNumDeposits());
System.out.println("Number of withdrawals: " +
savings.getNumWithdrawals());
System.out.println();
// Make some withdrawals.
savings.withdraw(100.00);
savings.withdraw(50.00);
savings.withdraw(10.00);
savings.withdraw(1.00);
savings.withdraw(1.00);
// Display what we've done so far.
System.out.printf("Balance: $%,.2f\n",
savings.getBalance());
System.out.println("Number of deposits: " +
savings.getNumDeposits());
System.out.println("Number of withdrawals: " +
savings.getNumWithdrawals());
System.out.println();
// Do the monthly processing.
savings.monthlyProcess();
// Display what we've done so far.
System.out.printf("Balance: $%,.2f\n",
savings.getBalance());
System.out.println("Number of deposits: " +
savings.getNumDeposits());
System.out.println("Number of withdrawals: " +
savings.getNumWithdrawals());
}
}
Superclass BankAccount.java
public class BankAccount
{
private double balance; //The balance in the account
private int numDeposits; //Number of deposits this month
private int numWithdrawals; //Number of withdrawals
private double interestRate; //Annual interest rate
private double monthlyServiceCharge; //Monthly service charge
/**
The constructor
Accept arguments for the balance and annual interest rate.
@param bal To hold the number of balance.
@param intRate To hold the number of annual interest rate.
@param mon To hold the number of monthly service charge.
*/
public BankAccount(double bal, double intRate, double mon)
{
balance = bal;
interestRate = intRate;
monthlyServiceCharge = mon;
}
/**
This method to hold the amount of deposit.
@param amount The amount of deposit.
*/
public void deposit(double amount)
{
balance = balance + amount;
numDeposits++;
}
/**
This method to hold the amount of withdrawal.
@param amount The amount of withdrawal.
*/
public void withdraw(double amount)
{
balance = balance - amount;
numWithdrawals++;
}
/**
This method to update the balance by calculating the monthly interest
earned by the account.
*/
private void calcInterest()
{
double monIntRate;
double monInt;
monIntRate = (interestRate / 12.0);
monInt = balance * monIntRate;
balance = balance + monInt;
}
/**
This method to calculate the monthly service charge.
*/
public void monthlyProcess()
{
balance = balance - monthlyServiceCharge;
calcInterest();
numWithdrawals = 0;
numDeposits = 0;
monthlyServiceCharge = 0;
}
/**
This method to hold the number of monthly service charge.
@param amount The number of monthly service charge.
*/
public void setMonthlyServiceCharges(double amount)
{
monthlyServiceCharge += amount;
}
/**
This method to return the amount of balance.
@return The amount of balance.
*/
public double getBalance()
{
return balance;
}
/**
This method to return the number of deposits.
@return The number of deposits.
*/
public int getNumDeposits()
{
return numDeposits;
}
/**
This method to return the number of withdrawals.
@return The number of withdrawals.
*/
public int getNumWithdrawals()
{
return numWithdrawals;
}
/**
This method to return the number of annual interest rate.
@return The number of annual interest rate.
*/
public double getInterestRate()
{
return interestRate;
}
/**
This method to return the amount of monthly service charge.
@return The amount of monthly service charge.
*/
public double getMonthlyServiceCharge()
{
return monthlyServiceCharge;
}
}
Subclass SavingsAccount.java
public class SavingsAccount extends BankAccount
{
private boolean status;
/**
The constructor
To accept the argument of balance, interest rate and monthly charge.
@param bal To hold the amount of balance.
@param intRate To hold the number of annual interest rate.
@param mon To hold the amount of monthly service charge.
*/
public SavingsAccount(double bal, double intRate, double mon)
{
super(bal, intRate, mon);
if (bal < 25)
{
status = false;
}
else
{
status = true;
}
}
/**
This method to determine whether the account is inactive before withdrawals
is made.
@param amount The amount of withdrawal.
*/
public void withdraw(double amount)
{
if (status = true)
{
super.withdraw(amount);
}
}
/**
This method to determine whether the account is inactive before a
deposit is made.
@param amount The amount of deposit.
*/
public void deposit(double amount)
{
if (status = true)
{
super.deposit(amount);
}
}
/**
This method to check the number of withdrawals.
*/
public void monthlyProcess()
{
if (getNumWithdrawals() > 4)
{
setMonthlyServiceCharges(getNumWithdrawals() - 4);
}
super.monthlyProcess();
if (getBalance() < 25)
{
status = false;
}
}
}
如上所述。我想只做两次退出，因为在主程序中当我做2撤销时，余额将变为20 $并且它变为不活动状态。但不知何故，我的代码确实撤了5次。那么有人可以给我一个如何解决这个问题的想法。谢谢！
答案 0 :(得分：0)
更改
public SavingsAccount(double bal, double intRate, double mon)
{
super(bal, intRate, mon);
if (bal < 25)
{
status = false;
}
else
{
status = true;
}
}
到
public void withdraw(double amount)
{
if (getBalance() > 25)
{
super.withdraw(amount);
}
}
和
public void withdraw(double amount)
{
if (status = true)
{
super.withdraw(amount);
}
}
到
public void withdraw(double amount)
{
if (getBalance() > 25)
{
super.withdraw(amount);
}
}