import java.util.HashMap;

public class SimpleDictionary {

    private HashMap<String, String> translations;

    public SimpleDictionary() {
        this.translations = new HashMap<>();
    }

    public String translate(String word) {
        return this.translations.get(word);
    }

    public void add(String word, String translation) {
        this.translations.put(word, translation);
    }

}

/////////////////////////////////////////////////////////

import java.util.Scanner;

public class TextUI {

    private Scanner scanner;
    private SimpleDictionary dictionary = new SimpleDictionary();

    public TextUI(Scanner scanner, SimpleDictionary dictionary) {
        this.scanner = scanner;
        this.dictionary = dictionary;
    }

    public void start() {

        while (true) {
            System.out.print("Command: ");
            String word = scanner.nextLine();

            if (word.equals("end")) {
                System.out.println("Bye bye!");
                break;
            }

            if (word.equals("add")) {
                System.out.print("Word: ");
                String word2 = scanner.nextLine();
                System.out.print("Translation: ");
                String translation = scanner.nextLine();
                dictionary.add(word2, translation);
                continue;
            }

            if (word.equals("search")) {
                System.out.print("To be translated: ");
                String search = scanner.nextLine();
                String result = dictionary.translate(search);
                if (result == null) {
                    System.out.println("Word " + search + " was not found");
                } else {
                    System.out.println(result);
                }
                continue;
            }

            System.out.println("Unknown command");

        }

    }

}