嵌套的while循環不循環嗎？

Question

這是代碼：

while (keepGoingDay.equals("y") || keepGoingDay.equals("y")){
        System.out.println(acct1);
        System.out.println(acct2);
        Account.reset();

        while (keepGoing.equals("y") || keepGoing.equals("y"))
            {
            //get account number, what to do, and amount
            System.out.print("\nEnter the number of the account you would like to access: ");
            acctNumber = scan.nextLong();
            System.out.print("Would you like to make a deposit (D) or withdrawal (W)? ");
            action = scan.next();
            System.out.print("Enter the amount: ");
            amount = scan.nextDouble();

            if (amount > 0)
                if (acctNumber == acct1.getAcctNumber())
                if (action.equals("w") || action.equals("W"))
                    acct1.withdraw(amount);
                else if (action.equals("d") || action.equals("D"))
                    acct1.deposit(amount);
                else 
                    System.out.println("Sorry, invalid action.");
                else if (acctNumber == acct2.getAcctNumber())
                if (action.equals("w") || action.equals("W"))
                    acct1.withdraw(amount);
                else if (action.equals("d") || action.equals("D"))
                    acct1.deposit(amount);
                else 
                    System.out.println("Sorry, invalid action.");
                else
                System.out.println("Sorry, invalid account number.");
            else
                System.out.println("Sorry, amount must be > 0.");


            System.out.print("\nMore transactions? (y/n)");
            keepGoing = scan.next();        
            }
        System.out.println("End of day stats: ");
        System.out.println("Number of deposits: " + Account.getNumDeposits());
        System.out.println("Number of withdrawals: " + Account.getNumWithdrawals());
        System.out.println("Total value of deposits: " + Account.getTotalDeposits());
        System.out.println("Total value of withdrawals: " + Account.getTotalWithdrawals());
        System.out.print("More days?");
        keepGoingDay = scan.next();
         }

}

我認為這些方法並不需要太重要，因此我省去了它們以節省空間。

該程序的目的是要記錄並記錄數天的交​​易（金額未知），所以我無法使用for循環。

它經過第一次運行，然后跳過內部while循環。

我看過牙套，但不認為這是問題所在。

Answer 1

您是說Y還是y ：

while (keepGoing.equals("Y") || keepGoing.equals("y")) 

您的代碼對同一件事（即y ）進行了兩次測試。

僅供參考，您的測試可以簡化為：

while (keepGoing.equalsIgnoreCase("y")) 

Answer 2

把scan.next(); 在您的acctNumber = scan.nextLong(); 行和amount = scan.nextDouble(); 線。

像這樣。 檢查我新添加的行。

            System.out.print("\nEnter the number of the account you would like to access: ");
            acctNumber = scan.nextLong();
            scan.next(); // newly added
            System.out.print("Would you like to make a deposit (D) or withdrawal (W)? ");
            action = scan.next();
            System.out.print("Enter the amount: ");
            amount = scan.nextDouble();
            scan.next(); // newly added

Answer 3

如果我可以靈活地更改框架程序，則可以使用布爾變量。

但是，您必須采用的解決方案是將keepGoing重置為“ y”，因為將其設置為“ n”會導致其被跳過。