345. 反转字符串中的元音字母

package aboutString;

import java.util.Scanner;

public class ReverseVowels {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        String s= in.nextLine();//im_on_iaul
        String ans =  reverseVowels(s);
        System.out.println(ans);

    }
    
    public static String reverseVowels(String s) {
        char [] ch = s.toCharArray();
        int i=0,j=ch.length-1;
        char tmp;
        while(i<j)
        {
            while(i<j && isVowels(ch[i])==false)
            {
                i++;
            }
            while(i<j&& isVowels(ch[j])==false)
            {
                j--;
            }
            tmp = ch[i];
            ch[i]=ch[j];
            ch[j]=tmp;
            i++;
            j--;
        }
        return String.valueOf(ch) ; 
    }
    public static boolean isVowels(char c)
    {
        if(c ==‘a‘||c ==‘e‘||c ==‘i‘||c ==‘o‘||c ==‘u‘||
                c ==‘A‘||c ==‘E‘||c ==‘I‘||c ==‘O‘||c ==‘U‘)
            return true ;
        else
        {
            return false;
        }
    }


}