HashMap-class

package com.company;

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

public class Main {

    public static void main(String[] args) {


        HashMap<String, Double> MyDictionary = new HashMap<String,Double>(16);



        //put-method
                        // key:value
        MyDictionary.put("Иван", 3.00);
        MyDictionary.put("Георги", 4.50);
        MyDictionary.put("Димитър", 5.50);
        MyDictionary.put("Веселин", 3.50);
        MyDictionary.put("Цанислав", 4.00);
        MyDictionary.put("Никол", 6.00);

        // --- размер на речника ---
        System.out.println("HashMap Size = " + MyDictionary.size());


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


        // --- remove-method ---
        MyDictionary.remove("Цанислав");
        System.out.println("Цанислав removed.");


        // --- contains-key ---
        System.out.printf("Is Цанислав in the hash table: %b %n",MyDictionary.containsKey("Цанислав"));

        // --- contains-value ---
        System.out.printf("Do we have 6.00 mark in the hash table: %b %n",MyDictionary.containsValue(6.00));

        // --- put-method --- за да променим стойността
        MyDictionary.put("Никол" , 3.25);
        System.out.println("Никол's mark changed.");

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

        System.out.println(MyDictionary);


        // --- FOR-EACH-CYCLE ---
        //принтираме key и value с entrySet
        for(Map.Entry<String,Double> items : MyDictionary.entrySet()){


          /*  if (items.getKey().equals("Димитър")) {
                System.out.printf("Оценката на %s е %.2f",items.getKey(),items.getValue());
            } */


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

        }

        System.out.printf("There are %d students.%n",MyDictionary.size());

        MyDictionary.clear();
        System.out.println("Students Dictionary (by hashmap) cleared.");

        System.out.printf("Is hash table empty: %b%n", MyDictionary.isEmpty());

    }
}