LeetCode:Reverse Vowels of a String

total accepted:8150total submissions:23213difficulty:easy

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".

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(e) reverse string

 

code:

 

public class solution {
    
    public boolean isvowel(char c) {
        if('a' <= c && c <= 'z') c += 'a'-'a';
        return c=='a' || c=='e' || c=='i' || c=='o' || c=='u';
    }
    
    public string reversevowels(string s) {
        int len = s.length();
        char[] chs = s.tochararray();
        int i=0,j=len-1;
        while(i