Untitled

public class Reverse {
    static void reverseString(String s) {
        if(s.length() == 0){
            return;
        }
        System.out.print(s.charAt(s.length()-1));
        reverseString(s.substring(0,s.length()-1));


    }
    public static void main(String[] args) {
        reverseString("abnbn");
    }
}