Phonebook1

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


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

        LinkedHashMap<String, String> phonebook = new LinkedHashMap<>();
        String input =  console.nextLine();

        while (!(input == "END")) {
            String[] commandArgs = input.split(" ");
            String command = commandArgs[0];

            switch (command){
                case "A":
                    String name = commandArgs[1];
                    String phoneNum = commandArgs[2];
                    AddToPhonebook(phonebook, name, phoneNum);
                    break;

                case "S":
                    name = commandArgs[1];
                    SearchInPhonebook(phonebook, name); break;
            }
            input = console.nextLine();
        }
    }

    private static void SearchInPhonebook(LinkedHashMap<String, String> phonebook, String name) {
        if (phonebook.containsKey(name)) {
            System.out.printf("%s -> %s\n", name, phonebook.get(name));
        }
        else System.out.printf("Contact %s does not exist.\n", name);
    }

    private static void AddToPhonebook(LinkedHashMap<String, String> phonebook, String name, String phoneNum) {
        if (!phonebook.containsKey(name)) {
            phonebook.put(name, phoneNum);
        }
        else {
            phonebook.replace(name, phonebook.get(name), phoneNum);
        }
    }
}