1282. 翻转字符串中的元音字母

  写一个方法，接受给定字符串作为输入，并且只翻转字符串中的元音字母。

样例

样例 1: 输入 : s = "hello" 输出 : "holle" 样例 2: 输入 : s = "lintcode" 输出 : "lentcodi".

注意事项

元音字母不包含字母 "y"。     public class Solution {     /**      * @param s: a string      * @return: reverse only the vowels of a string      */     public String reverseVowels(String s) {         // write your code here         HashSet<Character> array = new HashSet<>();         array.add('a');         array.add('e');         array.add('i');         array.add('o');         array.add('u');         array.add('A');         array.add('E');         array.add('I');         array.add('O');         array.add('U');             char[] chars = s.toCharArray();         int start = 0;         int end = chars.length - 1;         char temp;         while (start < end) {             if (array.contains(chars[start]) && array.contains(chars[end])) {                 temp = chars[start];                 chars[start] = chars[end];                 chars[end] = temp;                 start++;                 end--;             } else if (!array.contains(chars[start]) && !array.contains(chars[end])) {                 start++;                 end--;             } else if (!array.contains(chars[end])) {                 end--;             } else {                 start++;             }         }         return String.valueOf(chars);     } }