如何使用扫描仪使此switch语句正常工作？ [英] How can I get this switch statement to work using a scanner?

问题描述

我正在尝试编写一个程序，将字母表中的任何字母（大写或小写）切换为Phontic字母表。例如，如果我输入A或a，我的程序将给我（更改为）Alpha。
我已经对这个和切换语句做了很多研究，但我一直陷入困境。我意识到我不能在扫描仪中使用'char'。但是，当我将'char'更改为'String'时，我的switch语句会混乱（特别是我的代码中的 toUpperCase 会被加下划线。我无法看到我的错误。这就是我所做的远：

I'm trying to write a program that will switch any letter of the alphabet (upper or lower cases) into the Phontic alphabet. For example, If I enter "A" or "a" my program will give me (change it to) "Alpha". I've done so much research on this and switch statements but I keep getting stuck. I've realized that I can't use 'char' in a scanner. However, when I change 'char' into a 'String' my switch statement messes up (specifically the toUpperCase in my code gets underlined. I can't see my mistake. Here's what I've done so far:

import java.util.Scanner;
public class PhoneticTranslate {
public static void main(String[] args) {


char letter;
String phonetic;

Scanner kb = new Scanner(System.in);


System.out.print("Please enter a letter: ");
letter = kb.next();

switch(Character.toUpperCase(letter))
{
case 'A':
    phonetic = "Alpha";
break;
case 'B':
    phonetic = "Bravo";
    break;
case 'C':
    phonetic = "Charlie";
    break;
case 'D': 
    phonetic = "Delta";
    break;
case 'E':
    phonetic = "Echo";
    break;
case 'F':
    phonetic = "Foxtrot";
    break;
case 'G':
    phonetic = "Golf";
    break;
case 'H':
    phonetic = "Hotel";
    break;
case 'I':
    phonetic = "India";
    break;
case 'J':
    phonetic = "Juliet";
case 'K':
    phonetic = "Kilo";
    break;
case 'L':
    phonetic = "Lima";
    break;
case 'M':
    phonetic = "Mike";
    break;
case 'N':
    phonetic = "November";
    break;
case 'O':
    phonetic = "Oscar";
    break;
case 'P':
    phonetic = "Papa";
    break;
case 'Q':
    phonetic = "Quebec";
    break;
case 'R':
    phonetic = "Romeo";
    break;
case 'S':
    phonetic = "Sierra";
    break;
case 'T':
    phonetic = "Tango";
    break;
case 'U':
    phonetic = "Uniform";
    break;
case 'V':
    phonetic = "Victor";
    break;
case 'W':
    phonetic = "Whiskey";
    break;
case 'X':
    phonetic = "X-Ray";
    break;
case 'Y':
    phonetic = "Yankee";
    break;
case 'Z':
    phonetic = "Zulu";
    break;


}

}
}

推荐答案

你需要使用charAt。 Scanner.next（）方法返回字符串不是字符所以你需要将 String 转换为 char

You need to use charAt. Scanner.next() method returns String not char so you will need to convert String to char

letter = kb.next().charAt(0);

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