ТЕМА_17_CW

//ТЕМА_17 Работа в клас//

import java.util.HashMap;
import java.util.Map;

public class UASD_2_190421_CW {
    public static void main(String[] args) {
        HashMap<String, Double> MyDictionary = new HashMap<>(16);
        //        key : value

        MyDictionary.put("Pesho", 3.00);
        MyDictionary.put("Gosho", 4.50);
        MyDictionary.put("Nakov", 5.50);
        MyDictionary.put("Vesko", 3.50);
        MyDictionary.put("Tsanev", 4.00);
        MyDictionary.put("Nerdy", 6.00);

        //PRINTING THE SIZE OF THE HASHMAP//
        System.out.println("HashMap Size: " + MyDictionary.size());

        //GET//
        Double tsanevMark = MyDictionary.get("Tsanev");
        System.out.printf("Tsanev`s mark %.2f: %n", tsanevMark);
        //FORMAT PRINT; буфери(в случая до втория знак след десетичната запетая; %n - нов ред)//

        //REMOVE//
        MyDictionary.remove("Tsanev");
        System.out.println("Tsanev removed.");

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

        //CONTAINS VALUE//
        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 (чрез for-each): ");

        //FOR-EACH-CYCLE ::::::::::::::: HASH-MAP//
        //PRINT KEYS AND VALUES BY ENTRYSET() METHOD...................//

        for(Map.Entry<String, Double> items : MyDictionary.entrySet()){
            System.out.printf("Student %s has %.2f%n", items.getKey(), items.getValue());
        }

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

        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());

    }
}