Question

我在java中创建了一个程序来计算字符串中的小写元音和大写元音。但是输出没有以正确的方式显示。

我的代码：

import java.util.Scanner;

public class Vowelscount {
    public static void main(String args[]){

        Scanner keyboard = new Scanner(System.in);
        System.out.println("Give a string ");
        String input=keyboard.nextLine();
        char []chars=input.toCharArray();



        int upperCase = 0;
        int lowerCase = 0;
        int vowelcount=0;
        for(char c : chars) {

            switch(c){
            case 'a':case 'A':
            case 'e':case 'E':
            case 'i':case 'I':
            case 'o':case 'O':
            case 'u':case 'U':
                vowelcount++;
                break;

            }

        }
        for (int k = 0; k < input.length(); k++) {
            // Check for upper case letters.
            if (Character.isUpperCase(input.charAt(k))) upperCase++;

            // Check for lower case letters.
            if (Character.isLowerCase(input.charAt(k))) lowerCase++;
        }

        System.out.printf("There are %d uppercase letters and %d lowercase letters.",upperCase,lowerCase);
        System.out.printf("Number of vowels="+vowelcount);

}}

Answer 1

使用java 8功能可以轻松完成：

String str = "lalfalk;jwerLSKJDFLKJWEROIURE";

long upperCase = str.chars()
        .mapToObj(c -> (char) c)                // getting Stream<Character> with each char in the String
        .filter(c -> "AEIOU".indexOf(c) > -1)   // filter just to leave the upper case vowels
        .count();                               // count the number of vowels found in the String

// using the same logic
long lowerCase = str.chars()
        .mapToObj(c -> (char) c)
        .filter(c -> "aeiou".indexOf(c) > -1)
        .count();

// the total number of vowels is the sum of the number of upper and lower found in the string
long vowelcount = upperCase + lowerCase;

System.out.printf("There are %d uppercase letters and %d lowercase letters. ", upperCase, lowerCase);
System.out.printf("Number of vowels = " + vowelcount);

输出：

有5个大写字母和3个小写字母。数量元音= 8

Answer 2

你的第二个循环不会过滤辅音。首先，您需要检查字符是否为元音，然后检查它是大写还是小写。

SELECT name, sum(qty*rate) FROM salesdetails as s JOIN sales as ss on (ss.invno=s.invno) 
JOIN customer as c ON (ss.customerno = c.custno) GROUP BY(c.name) 
HAVING sum(qty*rate) IN (SELECT max(exp) FROM (SELECT  sum(qty*rate) 
AS exp from salesdetails as s JOIN sales as ss on (ss.invno = s.invno) 
JOIN customer as c ON (ss.customerno = c.custno) GROUP BY(c.name) ORDER BY sum(qty*rate)) aa);

Answer 3

正如其他人所提到的，你不仅要计算元音，你也可以使用select case来计算大写和小写，请查看下面的代码。我稍微修改了你的代码。

import java.util.Scanner;

public class Vowelscount {
    public static void main(String args[]){
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Give a string ");
        String input=keyboard.nextLine();
        char []chars=input.toCharArray();
        int upperCase = 0;
        int lowerCase = 0;
        int vowelcount=0;
        for(char c : chars) {
            switch(c){
               case 'a':
               case 'e':
               case 'i':
               case 'o':
               case 'u':
                  vowelcount++;
                  lowerCase++;
                  break;
               case 'A':
               case 'E':
               case 'I':
               case 'O':
               case 'U':
                  vowelcount++;
                  upperCase++;
                  break;
           }  

        }

        System.out.printf("There are %d uppercase letters and %d lowercase letters.",upperCase,lowerCase);
        System.out.printf("Number of vowels="+vowelcount);
    }
}

Answer 4

您可以非常轻松地使用某些Java 8流执行此操作：

@Test
public void shouldCountUpperAndLowerCaseVowels() {
    final String input = "Some test INPUT string";
    final Long upper = input.chars().filter(i -> Arrays.asList('A','E','I','O','U').contains((char)i)).count();
    final Long lower = input.chars().filter(i -> Arrays.asList('a','e','i','o','u').contains((char)i)).count();
    System.out.printf("Vowels:%nUppercase: %d%nLowercase: %d%nTotal: %s%n", upper, lower, upper + lower);
}

输出：

元音：

大写：{uc}

小写：{lc}

总计：{uc + lc}

如何计算字符串中的大写元音和小写元音？

4 个答案: