import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;

public class QASADS {
    public static void main(String[] args){
        HashMap<String,Double> MyDictionary = new HashMap<>( 6);


        MyDictionary.put("Николай",  3.00);
        MyDictionary.put("Нина",  4.50);
        MyDictionary.put("Сжетослав",  5.50);
        MyDictionary.put("Стефан",  3.50);
        MyDictionary.put("Христо", 4.00);
        MyDictionary.put("Юлиaн",  6.00);


        System.out.println("HashMap Size : " + MyDictionary.size());



        Double tsanevMark = MyDictionary.get("Tsanev");
        System.out.printf("Tsanev's mark: %.2f %n", tsanevMark);

        System.out.println(MessageFormat.format("Tsanev''s mark: {0,number,#.##}", tsanevMark));



        MyDictionary.remove("Светослав");
        System.out.println("Светослав removed.");


        System.out.printf("Is Tsanev in the hash table: %b %n", MyDictionary.containsKey("Светослав"));

        System.out.printf("Is Tsanev in the hash table: %b %n", MyDictionary.containsValue(6.00));



        MyDictionary.put("Nerdy", 3.25);
        System.out.println("Nerdy's mark changed.");


        System.out.println("Students and marks:");

        for (Map.Entry<String, Double> items : MyDictionary.entrySet()) {

            System.out.printf("Student %s has %.2f%n", items.getKey(), items.getValue());
        }


        System.out.printf("There are %d students.%n", MyDictionary.size());
        MyDictionary.clear();
        System.out.println("Students hashmap cleared.");
        System.out.printf("Is hash table empty: %b%n", MyDictionary.isEmpty());






















    }
}