Class Solution

ReverseString.java:1–13

class Solution {
    public void reverseString(char[] s) {
        int j=s.length-1;
        int i=0;
        while(i<j)
        {
           char t=s[i];
            s[i]=s[j];
            s[j]=t; 
            i++;j--;
        }  
    }
}