java - 如何打印元音、数字等列表？

Question

这个程序接受一个语句，然后打印元音、数字等的数量。我想知道如何打印作为输入给出的数字和元音列表。有人可以告诉我如何使用数组来完成此操作吗？

package strings;
import java.util.Scanner;

public class Strings
{
    public static void main(String [] abc)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a statement:");
        String statement = sc.nextLine().toLowerCase();
        System.out.println("------------------------------------------------");
        System.out.println("Total characters: " + statement.length());
        int vowels = 0,num = 0,spaces = 0,spl = 0,others = 0;

        char alpha;

        for (int i = 0;i < statement.length();i++)
        {
            alpha = statement.charAt(i);
            if (alpha == 'a' || alpha == 'e' || alpha == 'i' || alpha == 'o' || alpha == 'u')
            {
                vowels++;
            }
            else if (alpha == ' ')
            {
                spaces++;
            }
            else if (alpha == '0' || alpha == '1' || alpha == '2' || alpha == '3' || alpha == '4'  || alpha == '5' || alpha == '6' || alpha == '7' || alpha == '8' || alpha == '9')
            {
                num++;
            }
            else if (alpha =='!' || alpha =='@' || alpha =='#' || alpha =='$' || alpha =='%' || alpha =='^' || alpha =='&' || alpha =='*' || alpha =='(' || alpha ==')')
            {
                spl++;
            }
            else
            {
                others++;
            }
        }
        System.out.println("Total vowels: " + vowels);
        System.out.println("Total spaces: " + spaces);
        System.out.println("Total numerics: " + num);
        System.out.println("Total special characters: " + spl);
        System.out.println("Other characters: " + others);
        System.out.println("");



        for (int i = 0;i < statement.length();i++)
        {
            System.out.println("The vowels are as follows:");
            System.out.println(alpha);
        }
    }      
}

Answer 1

您可以使用java.util.ArrayList ，例如，为元音创建一个ArrayList:

List<Character> vowelList = new ArrayList<>();
...
for (int i = 0; i < statement.length(); i++) {
    if (alpha == 'a' || alpha == 'e' || alpha == 'i' || alpha == 'o' || alpha == 'u') {
         vowels++;
         vowelList.add(alpha);
     } else {

     ...
}
System.out.println("The vowels are as follows:");
System.out.println(vowelList);