Java String Token

Problem Statement

Given a string, find number of words in that string. For this problem a word is defined by a string of one or more english alphabets.

There are multiple ways to tokenize a string in java, learn how to tokenize a string in java and demonstrate your skill by solving this problem!

Input Format
A string not more than 400000 characters long. The string can be defined by following regular expression:

[A-Za-z !,?.\_'@]+

That means the string will only contain english alphabets, blank spaces and this characters: "!,?._'@".

Output Format
In the first line, print number of words n in the string. The words don't need to be unique. In the next n lines, print all the words you found in the order they appeared in the input.

Sample Input

He is a very very good boy, isn't he?

Sample Output

10

He

is

a

very

very

good

boy

isn

t

he

    import java.io.*;

    import java.util.*;

    public class Solution {

        static String[] retStringList(String inStr){

            String strOut=inStr.replace("!"," ")

                          .replace(","," ")

                          .replace("?"," ")

                          .replace("."," ")

                          .replace("_"," ")

                          .replace("'"," ")

                          .replace("@"," ");

            return strOut.split(" ");

        }

      

        public static void main(String[] args) 

        {

      

          Scanner scan = new Scanner(System.in);

          String s=scan.nextLine();

        //Complete the code

          String[] sOut=retStringList(s);

           int count=0;

            for(String strV:sOut){

              if(!strV.trim().equals("")){

                  count++;    

              }

              }

          System.out.println(count);

          for(String strV:sOut){

              if(!strV.trim().equals("")){

                  System.out.println(strV);    

              }

              }

        }

    }

Testcase 0

Input (stdin)

He is a very very good boy, isn't he?

Your Output (stdout)

10

He

is

a

very

very

good

boy

isn

t

he

Expected Output

10

He

is

a

very

very

good

boy

isn

t

he

Testcase1

Input (stdin)

Hello, thanks for attempting this problem! Hope it will help you to learn java! Good luck and have a nice day!

Your Output (stdout)

21

Hello

thanks

for

attempting

this

problem

Hope

it

will

help

you

to

learn

java

Good

luck

and

have

a

nice

day

Expected Output

21

Hello

thanks

for

attempting

this

problem

Hope

it

will

help

you

to

learn

java

Good

luck

and

have

a

nice

day