您如何检查字符串中的第一个字母是否等于某物? [英] How do you check to see if the 1st letter in a string is equal to something?

问题描述

在我的if语句中，我试图检查 string 的首字母是 Y 还是 y ，然后照这样进行.以下是我所拥有的，但我认为这是不正确的.

In my if statement, I'm trying to check if the first letter of a string is either Y or y, and then proceed as such. Below is what I have, but I don't believe it to be correct.

System.out.print("Do you wish to do another calculation (Yes/No): ")
      option = scan.next();
         if (option.substring(0,1) == "N" && option.substring(0,1) == "n" )
         {
            System.out.println("Have a good day");
            System.exit(0);
         }
bmi.setOption(option);

我早先在程序中将 option 实例化为 String option ="; .我知道如何检查字符串是否等于某个字符，但是很难检查字符串的第一个字符是否等于某个字符.

I instantiated option as String option = " "; earlier on in my program. I know how to check if strings equal a certain character, however am having trouble checking to see if only the FIRST character of the string is equal to something.

谢谢！

推荐答案

if (Character.toLowerCase(option.charAt(0)) == 'n')

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