345. Reverse Vowels of a String

Write a function that takes a string as input and reverse only the vowels of a string.

Example 1:
Given s = “hello”, return “holle”.

Example 2:
Given s = “leetcode”, return “leotcede”.

Note:
The vowels does not include the letter “y”.

public class Solution {      static final String vowels = "aeiouAEIOU";      public String reverseVowels(String s) {          int first = 0, last = s.length() - 1;          char[] array = s.toCharArray();          while(first < last){              while(first < last && vowels.indexOf(array[first]) == -1){                  first++;              }              while(first < last && vowels.indexOf(array[last]) == -1){                  last--;              }              char temp = array[first];              array[first] = array[last];              array[last] = temp;              first++;              last--;          }          return new String(array);      }  }