added reverseVowelsOfAString

String/reverseVowelsOfAString.java

@@ -0,0 +1,53 @@
+// 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 {
+
+    public String reverseVowels(String s) {
+
+        if(s == null || s.length() == 0) return s;
+
+        String vowels = "aeiouAEIOU";
+
+        char[] chars = s.toCharArray();
+
+        int start = 0;
+        int end = s.length() - 1;
+
+        while(start < end) {
+
+            while(start < end && !vowels.contains(chars[start] + "")) {
+
+                start++;
+
+            }
+
+            while(start < end && !vowels.contains(chars[end] + "")) {
+
+                end--;
+
+            }
+
+
+            char temp = chars[start];
+            chars[start] = chars[end];
+            chars[end] = temp;
+
+            start++;
+            end--;
+
+        }
+
+        return new String(chars);
+
+    }
+
+}