java - 嵌套的 while 循环不循环？

Question

代码如下:

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();
         }

}

我认为这些方法对此并不是太重要，因此我将省略它们以节省空间。

该程序的目标是记录和计算多天的交易(金额未知，因此我无法使用 for 循环)。

它顺利地完成了第一次运行，之后，它跳过了内部 while 循环。

我看过大括号，不认为这是问题所在。

Answer 1

您是指Y还是y:

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

您的代码测试了同一件事，即 y，两次。

仅供引用，您的测试可以简化为:

while (keepGoing.equalsIgnoreCase("y"))