Maps, Lambda and Stream API - Exercise - Parking

package com.company;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

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

        Map<String, String> data = new LinkedHashMap<>();



        int number = Integer.parseInt(scanner.nextLine());
        System.out.println();

        for (int i = 0; i < number; i++) {
            String[] commands = scanner.nextLine().split(" ");
            String name = commands[1];


            if (commands.length == 2){


                if (!data.containsKey(name)){
                    System.out.printf("ERROR: user %s not found\n",name);
                }else {
                    data.remove(name);
                    System.out.printf("%s unregistered successfully\n",name);
                }
            }else if (commands.length == 3){
                String licensePlate = commands[2];
                if (!data.containsKey(name)){
                    data.put(name,licensePlate);
                    System.out.printf("%s registered %s successfully\n",name,licensePlate);
                }else {
                    System.out.printf("ERROR: already registered with plate number %s\n",licensePlate);
                }
            }

        }

        data.entrySet().forEach(e -> {
            System.out.printf("%s => %s\n",e.getKey(),e.getValue());
        });
    }
}