How to combine words in a collection?

Question

Java

Yes, here is the assignment:

1) Create a class MyTranslator with private field dictionary of HashMap
type. Add method addNewWord(String en, String ru), which add to dictionary new
word in two languages.
2) Add a new method translate(String en) which take some string in English, and returns
its translation in Russian as the value of the type String.
3) Create a class Main with a main() method. Add to method main() code creates
an instance of MyTranslator. Add code to fill MyTranslator with few en-rus words pair
by invoking addNewWord() method.
For example:
“cat”, “cat”
“mouse”, “mouse”

I have already implemented part of the code, but I stop on the fact that they would combine words together when translating

public class MyTranslator {
    private HashMap<String, String> dictionary;

    public MyTranslator(HashMap<String, String> dictionary) {
        this.dictionary = dictionary;
    }

    @Override
    public String toString() {
        return dictionary + "";
    }

    public MyTranslator() {
        dictionary = new HashMap<>();
    }

    public void addNewWord(String en, String ru) {
        dictionary.put(en, ru);
    }

    public String translate(String en) {

        for (Map.Entry<String, String> d : dictionary.entrySet())
            System.out.print(d.getValue() + " ");
        return en;
    }
}

how to write the translate method correctly so that it finds the word in the dictionary, combines it with others and displays it in the console, as indicated in the task?

4) Add code to read string from console and pass it into translate method. print result to
console.
5) Execute the program.
The program output must be like next example:
cat caught
mouse

Answer 1

Good evening.
1) You have a problem here:

public String translate(String en) {

        for (Map.Entry<String, String> d : dictionary.entrySet())
            System.out.print(d.getValue() + " ");
        return en;
    }

You need to pass a word in English to the method. language, and return the word in Russian. And you send and return English. word

Add a new method translate(String en) which take some string in English, and returns
its translation in Russian as the value of the type String.

2) This is, in theory, even superfluous. The task says that you will replenish the dictionary using the addNewWord method

public MyTranslator(HashMap<String, String> dictionary) {
        this.dictionary = dictionary;
    }

3)

how to write the translate method correctly so that it finds the word in the dictionary, combines it with others and displays it in the console, as indicated in the task?

You need to use the get method to enter the key (word in English) and get the translation ().
For example,

public String translate(String en) {
return this.dictionary.get(en);
    }

PS Here colleague Dmitry Roo is right. It is necessary to get a string in the translate method, break it into parts, get the translations from the collection. I made a mistake here.
4)

Add code to read string from console and pass it into translate method. print result to
console.

Create a method to help read and add words to the dictionary from the console. Look to the sideScanner, System.in

Answer 2

public String translate(String en) {
        return Arrays.stream(en.split(" ")) // создаем стрим из массива. Массив - строка разбитая по пробелам
                .map(dictionary::get)  // Мапим каждый элемент из коллекции dictionary
                .collect(Collectors.joining(" ")); // собираем стрим в одну строку, прибавляя пробел между элементами
    }