需要使用數組與switch語句

Question

你好的StackOverflow社區當常量表達式，我剛開始與陣列的工作，我想知道我怎樣才能使switch語句的工作與下面的值。這真是刺激，這將無法正常工作考慮的唯一錯誤常量表達式要求：

import java.lang.Character; 

public class Ass11a { 

    public static char[] vowel = new char[4]; 
    public static char[] consonant = new char[20]; 
    public static char[] number = new char[9]; 
    public static char[] punctuation = new char[10]; 
    public static void main(String[] args) { 
     EasyReader console = new EasyReader(); 
     System.out.print("Enter a character: "); 
     char input = console.readChar(); 
     Character.toLowerCase(input); 
     vowel[0] = 'a'; 
     vowel[1] = 'e'; 
     vowel[2] = 'i'; 
     vowel[3] = 'o'; 
     vowel[4] = 'u'; 

     consonant[0] = 'q'; 
     consonant[1] = 'w'; 
     consonant[2] = 'r'; 
     consonant[3] = 't'; 
     consonant[4] = 'y'; 
     consonant[5] = 'p'; 
     consonant[6] = 's'; 
     consonant[7] = 'd'; 
     consonant[8] = 'f'; 
     consonant[9] = 'g'; 
     consonant[10] = 'h'; 
     consonant[11] = 'j'; 
     consonant[12] = 'k'; 
     consonant[13] = 'l'; 
     consonant[14] = 'z'; 
     consonant[15] = 'x'; 
     consonant[16] = 'c'; 
     consonant[17] = 'v'; 
     consonant[18] = 'b'; 
     consonant[19] = 'n'; 
     consonant[20] = 'm'; 

     number[0] = '1'; 
     number[1] = '2'; 
     number[2] = '3'; 
     number[3] = '4'; 
     number[4] = '5'; 
     number[5] = '6'; 
     number[6] = '7'; 
     number[7] = '8'; 
     number[8] = '9'; 
     number[9] = '0'; 

     punctuation[0] = '.'; 
     punctuation[1] = ','; 
     punctuation[2] = '?'; 
     punctuation[3] = '!'; 
     punctuation[4] = ';'; 
     punctuation[5] = ':'; 
     punctuation[6] = '"'; 
     punctuation[7] = '\''; 
     punctuation[8] = '('; 
     punctuation[9] = ')'; 
     punctuation[10] = '-';                                    
     switch(input) 
     { 
      case vowel[0]:case vowel[1]:case vowel[2]:case vowel[3]:case vowel[4]: 
       System.out.println("Vowel"); 
       break; 
      case consonant[0]:case consonant[1]:case consonant[2]:case consonant[3]: 
      case consonant[4]:case consonant[5]:case consonant[6]:case consonant[7]: 
      case consonant[8]:case consonant[9]:case consonant[10]:case consonant[11]: 
      case consonant[12]:case consonant[13]:case consonant[14]:case consonant[15]: 
      case consonant[16]:case consonant[17]:case consonant[18]:case consonant[19]: 
      case consonant[20]: 
       System.out.println("Consonant"); 
       break; 
      case number[0]:case number[1]:case number[2]:case number[3]:case number[4]: 
      case number[5]:case number[6]:case number[7]:case number[8]:case number[9]: 
       System.out.println("Number"); 
       break;        
      case punctuation[0]:case punctuation[1]:case punctuation[2]:case punctuation[3]: 
      case punctuation[4]:case punctuation[5]:case punctuation[6]:case punctuation[7]: 
      case punctuation[8]:case punctuation[9]:case punctuation[10]:  
       System.out.println("Punctuation"); 
       break; 
      default: 
       System.out.println("Other"); 
       break;    
     } 
    } 
} 

Answer 1

你可以使用一個enum這樣

public enum Vowels { 
    A,E,I,O,U; 
    static boolean isVowel(char c) { 
    switch (c) { 
    case 'A': case 'a': 
    case 'E': case 'e': 
    case 'I': case 'i': 
    case 'O': case 'o': 
    case 'U': case 'u': return true; 
    } 
    return false; 
    } 
    static Vowels getVowel(char c) { 
    switch (c) { 
    case 'A': case 'a': return A; 
    case 'E': case 'e': return E; 
    case 'I': case 'i': return I; 
    case 'O': case 'o': return O; 
    case 'U': case 'u': return U; 
    } 
    return null; 
    } 
} 

，並使用它像

public static void main(String[] args) { 
    Scanner console = new Scanner(System.in); 
    while (console.hasNextLine()) { 
    String input = console.nextLine(); 
    for (Character ch : input.toCharArray()) { 
     if (Vowels.isVowel(ch)) { 
     System.out.println(ch + " is vowel"); 
     } 
    } 
    } 
}