编辑代码

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        char[] ch = str.toCharArray();
        for(int i = 0; i < ch.length; i++) {
            if(ch[i] == 'a' || ch[i] == 'e' || ch[i] == 'i' || ch[i] == 'o' || ch[i] == 'u') {
                ch[i] += 32;
            } else if(ch[i] > 'A' && ch[i] < 'Z') {
                if(ch[i] != 'A' && ch[i] != 'E' && ch[i] != 'I' && ch[i] != 'O' && ch[i] != 'U' && ch[i] != ' ')
                    ch[i] -= 32;
            }
        }

        // 用StringBuffer类来将字符数组转为字符串
        StringBuffer sb = new StringBuffer();
        for(int i = 0; i < ch.length; i++) {
            sb.append(ch[i]);
        }

        System.out.println(sb);

    }
}