java 结合 charAt 和 IgnoreCase？
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combining charAt and IgnoreCase?
提问by Razoll
(Beginner with java here),
（这里是java初学者），
I'm making a simple game where the user can type if he wants to play again or not. However, I want the game to keep replaying as long as he types yes, Yes or any combination of yes. So As long as the first letter is ythe game continues. Ex)
我正在制作一个简单的游戏，用户可以在其中输入是否要再次玩。但是，我希望只要他输入“是”、“是”或“是”的任意组合，游戏就可以继续重播。所以只要第一个字母是y游戏就继续。前任）
Game Runs
游戏运行
} while(newGame.charAt (0) == 'y');
But I also want java to ignore if it is Yor y, I tried combining charAt(0) == 'y'and IgnoreCase but couldn't figure it out.
但我也希望 java 忽略它是Y还是y，我尝试组合charAt(0) == 'y'和 IgnoreCase 但无法弄清楚。
I know I could just do && 'Y', but seems like it is unnecessary code?
我知道我可以做&& 'Y'，但似乎这是不必要的代码？
Thanks
谢谢
回答by Aasmund Eldhuset
A neat trick for case insensitivity is to simply convert to lowercase before you compare. The class Charactercontains a number of useful functions for manipulating characters, so you can do this:
不区分大小写的一个巧妙技巧是在比较之前简单地转换为小写。该类Character包含许多用于操作字符的有用函数，因此您可以这样做：
} while (Character.toLowerCase(newGame.charAt(0)) == 'y');
回答by 1Darco1
You should use the method String.startsWith. Its name is explaining what it is doing. To ignore case sensitivity, you can use String.toLowerCase(or toUpperCaserespectivly).
你应该使用方法String.startsWith。它的名字解释了它在做什么。要忽略区分大小写，您可以使用String.toLowerCase（或toUpperCase分别使用）。
This will result in the following:
这将导致以下结果：
if (newGame.toLowerCase().startsWith("y")) {
// Play again
}
回答by Razib
Based on the logic you described here I think you should use ||instead of &&.
基于你在这里所描述的逻辑，我认为你应该使用||代替&&。
And for ignoring case sensitivity you can Use Character's class static method toUpperCase()or toLowerCase(). Example -
对于忽略大小写敏感，您可以使用Character的类静态方法toUpperCase()或toLowerCase(). 例子 -
while(Character.toUpperCase(newGame.charAt (0)) == 'Y'){
...
...
...
}
回答by Pallav
You could ignore the case sensitivity by simply converting the character to lower case or upper case using toLowercase()or toUppercase()methods.
您可以通过简单地使用toLowercase()或toUppercase()方法将字符转换为小写或大写来忽略区分大小写。
while(Character.toLowerCase(newGame.charAt(0)) == 'y');
while(Character.toUpperCase(newGame.charAt(0)) == 'y');
