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Question

我写了一个作业,试着计算一个字符串中每种元音的数字.

它编译得很好,但似乎在循环语句中循环,我看不出我做错了什么,尽管大约一个小时的谷歌搜索.

请帮忙!=]

 import java.util.Scanner;

 public class assignment3b
 {
public static void main(String[] args)
{
    int alpha=0, epsilon=0, india=0, oscar=0, uniform=0, position=0, length;

    String input;

    char letter;

    Scanner scan = new Scanner(System.in);

    System.out.println("Welcome to the vowel parse-o-matic");
    System.out.println("\nThis program will count all lower case vowels in whatever you type.");
    System.out.print("\nPlease enter the word you'd like to have parsed : ");

        input = scan.next();

        System.out.println("\n\nThe word " + input + " has: "); // reprints the word before stripping spaces

        input = input.replaceAll("\\s+","");                // Removes whitespace so they don't get counted.

    while (position < input.length());
    {
        letter = input.charAt(position);

        switch (letter)
        {
            case 'a':
                alpha = alpha + 1;
                position = position +1;
                break;
            case 'e':
                epsilon = epsilon + 1;
                position = position +1;
                break;
            case 'i':
                india = india + 1;
                position = position +1;
                break;
            case 'o':
                oscar = oscar + 1;
                position = position +1;
                break;
            case 'u':
                uniform = uniform + 1;
                position = position +1;
                break;
            default:
                position++;
                break;  
        }

        System.out.println("a's = " + alpha);
        System.out.println("e's = " + epsilon);
        System.out.println("i's = " + india);
        System.out.println("o's = " + oscar);
        System.out.println("u's = " + uniform);
        System.out.println("\nOther characters = " + (input.length() - alpha -epsilon - india -oscar - uniform));
    }
}

}

Answer 1

删除分号

while (position < input.length());
                                 ^

这是防止position增加