Java String Tokens

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.nextLine();
        scan.close();
        
        String s1[] = s.trim().split("[ !,?._'@]+");
        //int len = s1.length;
        //System.out.println(len);
        
        ArrayList<String> listOfStrings = new ArrayList<String>(Arrays.asList(s1));
        System.out.println(listOfStrings.size());
        for(String t:listOfStrings)
        {
            System.out.println(t);
        }
    }
}


output:
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