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                # Java 程序:使用`Switch Case`檢查元音或輔音 > 原文: [https://beginnersbook.com/2017/09/java-program-to-check-vowel-and-consonant-using-switch-case/](https://beginnersbook.com/2017/09/java-program-to-check-vowel-and-consonant-using-switch-case/) 字母`A`,`E`,`I`,`O`和`U`(小寫和大寫)被稱為元音,其余的字母表稱為輔音。在這里,我們將編寫一個 java 程序,使用 Java 中的 [`Switch Case`檢查輸入字符是元音還是輔音](https://beginnersbook.com/2017/08/java-switch-case/)。 > 如果您是 java 新手,請參閱 [Java 教程](https://beginnersbook.com/java-tutorial-for-beginners-with-examples/)以開始學習基礎知識 ## 示例:使用`Switch Case`檢查元音或輔音的程序 在這個程序中,我們沒有故意使用[`break`語句](https://beginnersbook.com/2017/08/java-break-statement/),因此如果用戶輸入任何元音,程序將繼續執行所有后續情況,直到達到`Case 'U'`并且我們正在設置布爾變量的值為`true`。通過這種方式,我們可以識別用戶輸入的字母是否為元音。 ```java import java.util.Scanner; class JavaExample { public static void main(String[ ] arg) { boolean isVowel=false;; Scanner scanner=new Scanner(System.in); System.out.println("Enter a character : "); char ch=scanner.next().charAt(0); scanner.close(); switch(ch) { case 'a' : case 'e' : case 'i' : case 'o' : case 'u' : case 'A' : case 'E' : case 'I' : case 'O' : case 'U' : isVowel = true; } if(isVowel == true) { System.out.println(ch+" is a Vowel"); } else { if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z')) System.out.println(ch+" is a Consonant"); else System.out.println("Input is not an alphabet"); } } } ``` 輸出 1: ```java Enter a character : A A is a Vowel ``` 輸出 2: ```java Enter a character : P P is a Consonant ``` 輸出 3: ```java Enter a character : 9 Input is not an alphabet ```
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