java - 调用Java方法

Question

我试图调用一个java方法来确定用户输入的字母是元音还是辅音。不确定如何正确调用该方法。

import java.util.*;
public class HW8Problem1{
   public static void main(String[] args) {

      Scanner input = new Scanner(System.in);

      System.out.print("Enter a letter: ");

      String letter = input.nextLine();

   }

   public static void vowel(String a){

      if (a.charAt(0) == 'a' || a.charAt(0) == 'A'){
         System.out.println(" is a vowel");

         if (a.charAt(0) == 'e' || a.charAt(0) == 'E')
            System.out.println(" is a vowel");

         if (a.charAt(0) == 'i' || a.charAt(0) == 'I')
            System.out.println(" is a vowel");

         if (a.charAt(0) == 'o' || a.charAt(0) == 'O')
            System.out.println(" is a vowel");

         if (a.charAt(0) == 'u' || a.charAt(0) == 'U')
            System.out.println(" is a vowel");

         else
            System.out.println(" is a consonant");    

      }
   }
}

Answer 1

您可以通过指定其名称后跟括号 (()) 来调用方法，其中包含要传递给该方法的参数(如果有)。就您而言，例如:

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.print("Enter a letter: ");
    String letter = input.nextLine();
    vowel(letter); // Here!
}