Question

我在使用某些java代码时遇到了一些问题，所以我想我会在这里问一下。我被要求添加一行代码来处理小写输入，但我不确定如何实现它。我可能非常喜欢看起来很容易解决，但是非常感谢任何帮助。

    import java.util.Scanner;

    public class Worksheet_7
    {
        public static void main(String[]args)
        {
            Scanner Fred = new Scanner(System.in);
            System.out.println("Today we practice using switch statements \n\n");
            char Ans;
            System.out.println("What kind of car do you drive");
            System.out.println("(F)ord, (C)hevy, (B)uick,(M)azda,(H)onda");
            String Word = Fred.next();
            Ans=Word.charAt(0);
            switch(Ans)
            {
                case 'C': System.out.println("Chevy-the heartbeat of America");
                System.out.println("Buy a ford");
                break;
                case 'F': System.out.println("Ford tough");
                System.out.println("Nice job cowboy");
                break;
                case 'B': System.out.println("Buick-Luxury you can afford");
                System.out.println("Seriously? A Buick? That's not Luxury");
                break;
                case 'M': System.out.println("Mazda-Zoom, Zoom");
                System.out.println("Can't really say anything");
                break;
                case 'H': System.out.println("Honda-Always dependable");
                System.out.println("Yeah, yeah, yeah");
                break;
                default: System.out.println("Need a better car...?");
            }
             System.out.println("\n\n done for now..");
        }
    }

Answer 1

Fred.next()是String

您需要在某处调用 String 的public String toUpperCase()方法。

注意：它返回一个新的String，而不是大写。

或者有Character方法 public static Character toUpperCase(char ch)

或者您可以更新案例

case 'c':
case 'C':
    ...
    break;
case 'f':
case 'F':
    ...
    break;

Answer 2

试试这个，用户char代替public static void main(String[]args) { Scanner Fred = new Scanner(System.in); System.out.println("Today we practice using switch statements \n\n"); String Ans; System.out.println("What kind of car do you drive"); System.out.println("(F)ord, (C)hevy, (B)uick,(M)azda,(H)onda"); String Word = Fred.next(); Ans=Word.substring(0, 1).toUpperCase(); switch(Ans) { case "C": System.out.println("Chevy-the heartbeat of America"); System.out.println("Buy a ford"); break; case "F": System.out.println("Ford tough"); System.out.println("Nice job cowboy"); break; case "B": System.out.println("Buick-Luxury you can afford"); System.out.println("Seriously? A Buick? That's not Luxury"); break; case "M": System.out.println("Mazda-Zoom, Zoom"); System.out.println("Can't really say anything"); break; case "H": System.out.println("Honda-Always dependable"); System.out.println("Yeah, yeah, yeah"); break; default: System.out.println("Need a better car...?"); } System.out.println("\n\n done for now.."); }：

AppDelegate.swift

Answer 3

您只需将开关更改为

即可

switch (ans.toUpperCase()){

如何正确使用toUpperCase（）;

3 个答案: