如何在Java中创建一个简单的元音计数器方法？

以下是我的方法：

public char[] ReturnAllVowels(String word)
{
    for (int i = 0; i < word.length(); i++)
    {
        if (word.contains("a" || "e" || "i" || "o" || "u"))     
        {

        }
    }        
}

public char[]返回所有元音（字符串字）
{
for（int i=0；i

---

它说| |不能应用于字符串类。那我怎么做呢？

使用正则表达式你可以试试

char ch = word.charAt (i);
if (ch == 'a' || ch=='e') {

}

int count = word.replaceAll("[^aeiouAEIOU]","").length();

---

你可以使用彼得的密码来获取元音

char[] vowels = word.replaceAll("[^aeiouAEIOU]","").toCharArray();

---

我就是这样做的

public static void main(String[] args) {
    // TODO code application logic here

    // TODO code application logic here
    String s;
    //String vowels = a;
    Scanner in = new Scanner(System.in);
    s = in.nextLine();

    for(int i = 0; i<s.length();i++){
        char v = s.charAt(i);
        if(v=='a' || v=='e' || v=='i' || v=='o' || v=='u' || v=='A' || v=='E' || v=='I' || v=='O' || v=='U'){
            System.out.print (v);
        }
    }
}

publicstaticvoidmain（字符串[]args）{
//此处的TODO代码应用程序逻辑
//此处的TODO代码应用程序逻辑
字符串s；
//字符串元音=a；
扫描仪输入=新扫描仪（系统输入）；
s=in.nextLine（）；
对于（inti=0；i，下面是我使用
扫描仪时应该做的事情

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);

    String userInput;
    int vowelA = 0, vowelE = 0, vowelI = 0, vowelO = 0, vowelU = 0; 

    System.out.println(welcomeMessage);
    userInput = scan.nextLine();
    userInput = userInput.toLowerCase();

    for(int x = 0; x <= userInput.length() - 1; x++) {
        if(userInput.charAt(x) == 97)
            vowelA++;
        else if(userInput.charAt(x) == 101)
            vowelE++;
        else if(userInput.charAt(x) == 105)
            vowelI++;
        else if(userInput.charAt(x) == 111)
            vowelO++;
        else if(userInput.charAt(x) == 117)
            vowelU++;   
    } 

    System.out.println("There were " + vowelA + " A's in your sentence.");
    System.out.println("There were " + vowelE + " E's in your sentence.");
    System.out.println("There were " + vowelI + " I's in your sentence.");
    System.out.println("There were " + vowelO + " O's in your sentence.");
    System.out.println("There were " + vowelU + " U's in your sentence.");
}

publicstaticvoidmain（字符串[]args）{
扫描仪扫描=新扫描仪（System.in）；
字符串用户输入；
int-vouela=0，vouele=0，voueli=0，vouelo=0，vouelu=0；
System.out.println（welcomeMessage）；
userInput=scan.nextLine（）；
userInput=userInput.toLowerCase（）；
对于（int x=0；x），Java中的方法名称应为小写（
returnallvowells
）。您的问题是希望获取
元音计数器
，但函数返回
char[]
。你想要一个计数器还是想要包含实际的元音？包含实际的元音，我不需要从小写字母开始。这只是品味的问题。每个人都有自己的写作方式。品味就像选择在新行上加上大括号一样，你的工作是编写人们能够理解的代码，标识符开头的大写字母通常表示（在Java中）类名而不是方法名。同样，以小写字母开头是一个古老的约定，如果不遵循上述约定，许多基于反射的工具可能会崩溃。嘿，小错误，请至少留下注释。
public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);

    String userInput;
    int vowelA = 0, vowelE = 0, vowelI = 0, vowelO = 0, vowelU = 0; 

    System.out.println(welcomeMessage);
    userInput = scan.nextLine();
    userInput = userInput.toLowerCase();

    for(int x = 0; x <= userInput.length() - 1; x++) {
        if(userInput.charAt(x) == 97)
            vowelA++;
        else if(userInput.charAt(x) == 101)
            vowelE++;
        else if(userInput.charAt(x) == 105)
            vowelI++;
        else if(userInput.charAt(x) == 111)
            vowelO++;
        else if(userInput.charAt(x) == 117)
            vowelU++;   
    } 

    System.out.println("There were " + vowelA + " A's in your sentence.");
    System.out.println("There were " + vowelE + " E's in your sentence.");
    System.out.println("There were " + vowelI + " I's in your sentence.");
    System.out.println("There were " + vowelO + " O's in your sentence.");
    System.out.println("There were " + vowelU + " U's in your sentence.");
}