我幾乎完成了這個銀行賬戶程序。我有一個calculateSavings()方法或calculateCheckings()方法的調用。如果currentBalance小于要求的minSavingsor minChecking，我有一個else語句來調用該isServiceCharge()方法來扣除費用。該程序沒有給我錯誤，但如果用戶輸入的 acurrentBalance小于minChecking或所需的數量minSavings，JOptionPane則不會顯示輸出。輸入仍然有效，但沒有彈出輸出。其他一切都可以正常工作，例如增加利息，但在服務費中扣除費用則不然。我怎樣才能解決這個問題？主班package com.company;import javax.swing.*;public class Main{ public static void main(String[] args) { { BankAccount myBank = new BankAccount(); myBank.calculateNewBalance(); } }}
2 回答
四季花海
TA貢獻1811條經驗 獲得超5個贊
這是一個小問題
如果您看到此功能，您將帳戶類型更改為'Savings' 或 'Checking'。
public void calculateNewBalance()
{
if (accountType.equals("S") || accountType.equals("s"))
{
accountType = "Savings";
calculateSavingsBalance();
} else if (accountType.equals("C") || accountType.equals("c"))
{
accountType = "Checking";
calculateCheckingBalance();
}
}
然而，您正在將 accountType 與'c' 或 's'進行比較
public void isServiceCharge()
{
if(accountType.equals("s") || accountType.equals("S"))
{
double newBalance = currentBalance - 10.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
else if(accountType.equals("c") || accountType.equals("C"))
{
double newBalance = currentBalance - 25.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
}
這就是它沒有進入任何一個塊的原因，因此，如果您將條件更改為以下語句
if(accountType.equals("Savings"))
else if(accountType.equals("Checking"))
它會按您的預期工作
慕姐8265434
TA貢獻1813條經驗 獲得超2個贊
你的代碼中實際發生了什么，
public void calculateNewBalance()
{
if (accountType.equals("S") || accountType.equals("s"))
{
accountType = "Savings";
calculateSavingsBalance();
} else if (accountType.equals("C") || accountType.equals("c"))
{
accountType = "Checking";
calculateCheckingBalance();
}
}
for s or S accountType = "Savings";
對于c 或 C accountType = "正在檢查";
但有趣的是在isServiceCharge()方法中
public void isServiceCharge()
{
if(accountType.equals("s") || accountType.equals("S"))
{
double newBalance = currentBalance - 10.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
else if(accountType.equals("c") || accountType.equals("C"))
{
double newBalance = currentBalance - 25.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
}
你檢查過
accountType.equals("s") || accountType.equals("S") //for savings
accountType.equals("C") || accountType.equals("c")// for checking
所以上述條件永遠不會滿足。
所以解決辦法是：
public void isServiceCharge()
{
if(accountType.equals("Savings"))
{
double newBalance = currentBalance - 10.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
else if(accountType.equals("Checking"))
{
double newBalance = currentBalance - 25.0;
JOptionPane.showMessageDialog(null, "Account Number: " + getAccountNumber() + "\nAccount Type: " + getAccountType() + "\nMinimum Balance: $" + getMinSavings()
+ "\nBalance Before Interest and Fees: $" + getCurrentBalance() + "\n\nNew Balance: $" + newBalance);
}
}
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