Registered Users

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.LinkedHashMap;
import java.util.Scanner;
import java.util.stream.Collectors;

class DateRecord {
    public int id;
    public LocalDate date;

    // Declaring a class constructor to create DateRecord object for our HashMap(Dictionary).
    // "This" keyword is used to reference to the class variables "id" and "date",
    // otherwise they will be hidden(shadowed) by the constructors local variables with the same name.
    public DateRecord(int id, LocalDate date) {
        this.id = id;
        this.date = date;
    }
    public int getId() {
        return this.id;
    }
    public LocalDate getDate() {
        return this.date;
    }
}

public class p01_Registered_Users {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String inputLine = scanner.nextLine();

        LinkedHashMap<String, DateRecord> registeredUsers = new LinkedHashMap<>();
        int id = 0;

        while (!"end".equals(inputLine)) {
            String[] tokens = inputLine.split(" -> ");
            String name = tokens[0];
            LocalDate parsedDate = parseDate(tokens[1]);

            registeredUsers.put(name, new DateRecord(id++, parsedDate));

            inputLine = scanner.nextLine();
        }

        LinkedHashMap<String, DateRecord> orderedData = registeredUsers.entrySet().stream()
                .sorted((d1, d2) -> d1.getValue().getDate().compareTo(d2.getValue().getDate()))
                .sorted((id1, id2) -> {return id2.getValue().getId() - id1.getValue().getId();})
                .limit(5).collect(Collectors.toMap(e -> e.)
    }

    private static LocalDate parseDate(String dateInput) {
        // Creating DateTimeFormatter to parse a date from a string using our custom pattern.
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyy");
        LocalDate date = LocalDate.parse(dateInput, formatter);

        return date;
    }
}