Do not answers silly

//
So I need to fill my stack with the characters of string and while i pop the characters 1 by 1 they will be added to another resultant string

*import java.util.*;
    public class ReverseStringUsingStack {
        private static String Reverse(String str) {
            int idx=0;
            Stack<Character> s = new Stack<Character>();
            while(idx< str.length()){
                s.push(str.charAt(idx));
            }

            StringBuilder result = new StringBuilder("");
            while(!s.isEmpty()){
                char curr = s.pop();
                result.append(curr);
            }
            return result.toString();
        }
        public static void main(String[] args) {
            String str = "abc";
            String ans = Reverse(str);
            System.out.println(ans);
        }
    }*

>Solution :

You must increase idx.

    while (idx < str.length()) {
        s.push(str.charAt(idx));
        idx++;
    }