Java program to reverse vowels of a string

• Java example program to reverse vowels in a string.
• One more java string interview question for freshers and experienced 
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Program : Java example program to Reverse Vowels  in a String

1. package inheritanceInterviewPrograms;
2. /*
3.  * @www.instanceofjava.com
4.  */
5. public class ReverseVowels {
6.     public static String reverseVowels(String string) {
7.  
8.         String vowelsStr = "aeiouAEIOU";
9.  
10.         int lo = 0;
11.         int hi = string.length() - 1;
12.         char[] ch = string.toCharArray();
13.  
14.  while (lo < hi) {
15.  
16.      if (!vowelsStr.contains(String.valueOf(string.charAt(lo)))) {
17.                 lo++;
18.                 continue;
19.        }
20.  
21.     if (!vowelsStr.contains(String.valueOf(string.charAt(hi)))) {
22.                 hi--;
23.                 continue;
24.        }
25.  
26.     // swaping variables
27.      swap(ch, lo, hi);
28.             lo++;
29.             hi--;
30.       }
31.  
32.         return String.valueOf(ch);
33.     }
34.  
35. private static void swap(char[] ch, int lo, int hi) {
36.  
37.         char temparray = ch[lo];
38.         ch[lo] = ch[hi];
39.         ch[hi] = temparray;
40.  
41.  }
42.     
43. public static void main (String args[]) {
44.         
45.          
46.  System.out.println("After reversing vowels in a string="reverseVowels("InstanceOfjava"));
47.         
48.          
49. }
50.  
51. }

Output:

1. After reversing vowels in a string=anstancOefjavI