Reverse a string using Recursive Technique

Source Code

import java.io.*;
public class Revstr//class name Revstr
{//program compiled by Gulzar
static String str,revst;//instance variables
Revstr()//default constructor
{
str="";
revst="";
}
public static void getstr()throws IOException
{
InputStreamReader read = new InputStreamReader
(System.in);
BufferedReader br=new BufferedReader(read);
System.out.println("Enter the string");//accept a string
str=br.readLine();//store the string in str
}
public static void recReverse(int len)throws IOException
{
char ch=' ';
if(len>=0)
{
ch=str.charAt(len);//extract each character from the string
revst=revst+ch;//store the reversed string
recReverse(--len);//to decrease the value of len by 1
}
}
public static void check()throws IOException
{
System.out.println("Original string...."+str);//display the string
System.out.println("Reversed string...."+revst);//disaply the reversed string
}
public static void main(String args[])throws IOException
{
Revstr ob=new Revstr();
ob.getstr();
ob.recReverse(str.length()-1);
ob.check();
}//program compiled by Gulzar
}

OUTPUT: