循环验证[重复]

Question

我正在制作一个基于文本的冒险游戏，我需要进行一些用户输入验证
我已经为这个特定实例设置了循环，但在输入正确的输入后，我似乎无法使循环中断。

代码：

    final String KNOCK;
    final String SLAM;
    System.out.println("Do you politely knock on the doors or do you slam them over?");
    System.out.println("Knock or Slam?");
    String decisionOne = userInput.nextLine().toUpperCase();
                
    if (decisionOne.equals("KNOCK"))
        System.out.println("You politely knock on the door. After a minute you decide to push on the handle.  The oak doors swing open, the old rusted iron hinges screaming into the dimly lit hallway in front of you. The Hall is roughly fifty feet long. Three doors on the East wall, and two doors on the west wall. The smell of mold, moisture, and iron hang thick in the air. What used to be a lush red carpet lines the entire length of the hallway up to a narrow set of stairs that reach up to another floor.");
        else if (decisionOne.equals("SLAM"))
            System.out.println("You slam into the heavy oak doors, the heavy iron hinges giving way with a pop. Dust settles around your head as you peer into the first room of The Keep. The Hall is roughly fifty feet long. Three doors on the western wall, and two doors on the eastern wall. The smell of mold, moisture, and iron hang thick in the air. What used to be a lush red carpet lines the entire length of the hallway up to a narrow set of stairs that reach up to another floor.");
        else {
            KNOCK = "KNOCK";
            SLAM = "SLAM";
            do {
                System.out.println("Your options are Knock or Slam. Don't be a rude.");
                decisionOne = userInput.nextLine().toUpperCase();
                if (decisionOne.equals("KNOCK"))
                    System.out.println("You politely knock on the door. After a minute you decide to push on the handle.  The oak doors swing open, the old rusted iron hinges screaming into the dimly lit hallway in front of you. The Hall is roughly fifty feet long. Three doors on the East wall, and two doors on the west wall. The smell of mold, moisture, and iron hang thick in the air. What used to be a lush red carpet lines the entire length of the hallway up to a narrow set of stairs that reach up to another floor.");
                else if (decisionOne.equals("SLAM"))
                    System.out.println("You slam into the heavy oak doors, the heavy iron hinges giving way with a pop. Dust settles around your head as you peer into the first room of The Keep. The Hall is roughly fifty feet long. Three doors on the western wall, and two doors on the eastern wall. The smell of mold, moisture, and iron hang thick in the air. What used to be a lush red carpet lines the entire length of the hallway up to a narrow set of stairs that reach up to another floor.");
            } while ((!decisionOne.equals("KNOCK")) || (!decisionOne.equals("SLAM")));
        }

我的输出是这样的：

你的选择是敲打还是猛击。别那么粗鲁。

大满贯

你猛地撞上沉重的橡木门，沉重的铁铰链砰的一声让位了。当你凝视城堡的第一个房间时，灰尘落在你的头上。大厅大约有五十英尺长。西墙有三扇门，东墙有两扇门。空气中弥漫着霉菌、湿气和铁的味道。曾经郁郁葱葱的红地毯沿着走廊一直延伸到一组狭窄的楼梯，一直延伸到另一层。你的选择是敲门或猛击。不要粗鲁。

问题是，如果您第一次输入了正确的值，那么代码将正常运行。如果您先输入了不正确的值，然后尝试输入正确的值，循环不会中断，并继续请求用户输入，而无需进入代码的下一步。

任何帮助都非常感谢！

谢谢你

Answer 1

如果您先输入不正确的值，然后尝试输入正确的值，循环不会中断，并继续要求用户输入，而不会进入代码的下一步。

更改：

while ((!decisionOne.equals("KNOCK")) || (!decisionOne.equals("SLAM")));

到：

while ((!decisionOne.equals("KNOCK")) && (!decisionOne.equals("SLAM")));

您只希望它在输入不等于“敲打”和“砰击”时继续循环。有了|（或）在其中，即使用户输入其中一个值，它也会循环运行。。。

Answer 2

循环的而部分将始终求值为true。

尝试：

while(!decisionOne.Equals("KNOCK") && !decisionOne.Equals("SLAM"));

Answer 3

只要此条件为true，您的do循环就会运行：

while ((!decisionOne.equals("KNOCK")) || (!decisionOne.equals("SLAM")))

用英语读给自己听...“而决定一不等于敲门或决定一不等于SLAM”。

假设decisionOne是敲门。该条件保持为true，因为decisionOne不等于SLAM，循环将永远持续。

您需要一个和条件：

while ((!decisionOne.equals("KNOCK")) && (!decisionOne.equals("SLAM")))