Leetcode Reverse String 344

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = “hello”, return “olleh”.

水一发

public class Solution { 
    public String reverseString(String s) { 
        char[] c = s.toCharArray(); 
        int len = s.length(); 
        int left = 0, right = len - 1; 
        while(left < right){ 
            char temp = c[left]; 
            c[left] = c[right]; 
            c[right] = temp; 
            left++; 
            right--; 
        } 
        String ans = String.valueOf(c); 
        return ans; 
    } 
}