class ReverseString

{

public static String reverse(String str){

if(str.length() == 0){

return str;

}

return reverse(str.substring(1)) + str.charAt(0);

}

public static String UsingStringBuffer(String str){

StringBuilder sb = new StringBuilder();

for(int i = str.length() - 1 ; i >= 0; i--){

sb.append(str.charAt(i));

}

return sb.toString();

}

public static void main(String[] args)

{

String str = "java";

String result = reverse(str);

System.out.println("Reverse of a string is :: " + result);

System.out.println("Reverse using StringBuilder" + UsingStringBuffer(str));

}

}