10.Predicate Party!

import java.util.*;
import java.util.function.Predicate;
import java.util.stream.Collectors;

public class functional1_Exercises_10Predicate_Party {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        List<String> names = Arrays.stream(scanner.nextLine().split("\\s+"))
                .collect(Collectors.toList());

        String command = scanner.nextLine();

        while (!command.equals("Party!")) {
            String[] tokens = command.split("\\s+");

            if (tokens[0].equals("Remove")) {

                List<String> namesDouble = names.stream()
                        .filter(predicateRemove(names, tokens[1], tokens[2]))
                        .collect(Collectors.toList());
                names.clear();
                names.addAll(namesDouble);
            } else {

                List<String> namesDouble = names.stream()
                        .filter(predicateAdd(names, tokens[1], tokens[2]))
                        .collect(Collectors.toList());
                names.addAll(namesDouble);
            }
            command = scanner.nextLine();
        }

        if (names.isEmpty()) {
            System.out.println("Nobody is going to the party!");
        } else {
            Collections.sort(names);
            System.out.print(names.toString().replaceAll("[\\[\\]]", ""));
            System.out.println(" are going to the party!");
        }
    }

    private static Predicate<String> predicateRemove(List<String> names, String type, String data) {
        Predicate<String> predicate = null;

        if (type.equals("StartsWith")) {
            predicate = f -> !f.startsWith(data);

        } else if (type.equals("EndsWith")) {
            predicate = e -> !e.endsWith(data);

        }
        if (type.equals("Length")) {
            predicate = e -> e.length() != Integer.parseInt(data);

        }
        return predicate;
    }

    private static Predicate<String> predicateAdd(List<String> names, String type, String data) {
        Predicate<String> predicate = null;
        if (type.equals("StartsWith")) {
            predicate = f -> f.startsWith(data);

        } else if (type.equals("EndsWith")) {
            predicate = e -> e.endsWith(data);

        } else if (type.equals("Length")) {
            predicate = e -> e.length() == Integer.parseInt(data);

        }
        return predicate;
    }

}