leetcode-Reverse String

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解析：这个题目是新题，不难。

public class Solution {
    public String reverseString(String s) {
        int len = s.length();
        char[] ch = s.toCharArray();
        char tmp;
        for(int i = 0, j = len-1; i<j ; i++,j--){
            tmp = ch[i];
            ch[i] = ch[j];
            ch[j] = tmp;
         }
         //array -> String 的另一种方式
         String str = new String(ch);
         return str;
    }
}