import java.util.Scanner;
import java.util.ArrayList;

public class A2Q5
{

    public interface Filter
    {
        boolean accept(Object x);
    }

    // class ShortWordFilter implements a Filter class for filtering a list of strings by char count
    public static class ShortWordFilter implements Filter
    {

        private static final ArrayList<String> theList = new ArrayList<>();

        // ShortWordFilter constructor gets word from main and sends to filter method for further processing
        public ShortWordFilter(Object word)
        {
            filter(word);
        }

        // filter method determines if string is less than 5 char long and assigns it to an arraylist if it is
        public void filter(Object word)
        {
            if (word.toString().length() < 5)
            {
                theList.add((String) word);
            }
        }

        // collectAll gets list of objects and data from Filter interface and assigns for main
        public static ArrayList<Object> collectAll(ArrayList<Object> objects, Filter f)
        {
            objects = new ArrayList<Object>(theList);
            return objects;
        }

    }

    // main method contains a loop asking for different words from the user
    public static void main(String[] args)
    {

        Scanner in = new Scanner(System.in);
        String word = "";

        ArrayList<Filter> filterList = new ArrayList<Filter>();

        while (!word.equals("0")) {
            System.out.println("Please input a word or '0' to end the loop:");
            word = in.nextLine();
            filterList.add(new ShortWordFilter(word) {});
        }

    }

 }