为什么((ans!='N')||(ans!='Y'))总是如此？

Question

我试图提示用户再次旋转,我的"while"表达总是回复为假...任何人都有任何想法？

reSpin = false;
if (reSpin == false){
    System.out.println("Would you like to spin again? Y/N");
    char ans = in.next().charAt(0);
   if (ans == 'Y'){
       reSpin =true;

   }else if (ans == 'N'){
       System.out.println("Thank you for playing!");
   }else {
       while ((ans != 'N') || (ans != 'Y')) {
           System.out.println("Invalid answer, please only enter Y/N");
           System.out.println("Would you like to spin again? Y/N");
           ans = in.next().charAt(0);
       }
   }


}

Answer 1

您可能想要使用:

   while ((ans != 'N') && (ans != 'Y')) {

检查ans是否不是N 而不是Y.如果你||在那里使用(或),那么它将检查ans是否不是N,或者不是Y(对于任何值都是如此ans).