345.反转字符串中的元音字母

class Solution {
    public String reverseVowels(String s) {
        char[] array = s.toCharArray();
        int i = 0;
        int j = array.length - 1;
        while(i < j){
            //不是偶数i++ j--
            if(!isVowel(array[i])){
                i++;
            }
            if(!isVowel(array[j])){
                j--;
            }
            //如果都是偶数进行交换
            if(isVowel(array[i]) && isVowel(array[j])){
                 char c = array[i];
                 array[i] = array[j];
                 array[j]= c;
                 i++; 
                 j--;
            }
        }

        return new String(array);

    }
    private boolean isVowel(char c){
        return c =='a' || c =='e' || c =='i' || c =='o'|| c =='u' || 
             c =='A' || c =='E' || c =='I' || c =='O'|| c =='U';
    }
}