Reverse character using void method

I ^:)^need help to write a parameterless, void and recursive method used to reverse a string of character. Can anybody help me with the last part?
This is the code I been able to write so far :

Code Java:

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import java.util.*;
public class Labex78
{
    public static String put = put;
    static boolean check= true;
               public static void main(String[] args)
	       {
 
                reverse();
               }   
              public static void reverse()			
                {
                 Scanner kbd= new Scanner(System.in);
                 if(check==true){
                 System.out.println("Enter 5 characters");
                   put = kbd.nextLine();
                  check= false;}
 
                 int len = put.length();
                   if(len<=1)
                   {
                     System.out.print(put);
                   }
                   else
                   {
                    String rev ="";
                    rev += put.charAt(put.length()-1); 
                    put= put.substring(0,put.length()-1);
                    reverse();
                    System.out.println(" Read backwards, character becomes "+ rev);
                   }
              }
 }

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What is the problem?

doesn't work . that ELSE part is not reversing the string. and I was wondering how I can use a void , parameterless function that is also recursive without keeping ro prompt the user to enter a string of characters. Basically how do use a string input by a user in such function??