HashMapClass

import java.util.*;

public class upr17 {
    public static void main(String[] args) {

        HashMap<String, Double> MyDictionary = new HashMap<String, Double>(10);


        MyDictionary.put("Иван", 3.50);
        MyDictionary.put("Ивайло", 5.50);
        MyDictionary.put("Джан", 6.00);
        MyDictionary.put("Мария", 5.00);
        MyDictionary.put("Никол",4.50);

        System.out.println(MyDictionary);

        //size
        System.out.println("MyDict size: = " + MyDictionary.size());

        //get by key
        System.out.printf("The Mark of Джан is : %.2f%n", MyDictionary.get("Джан"));

        //modify
        System.out.printf("Before the mark of Maria is : %.2f %n",  MyDictionary.get("Мария"));
        MyDictionary.put("Мария", 5.00);
        System.out.printf("After the mark of Maria is : %.2f %n",  MyDictionary.get("Мария"));


        //remove
        MyDictionary.remove("Иван");
        System.out.println("Иван is removed !");
        System.out.println("After removing " + MyDictionary);
        System.out.println("MyDict sieze after removing = " + MyDictionary.size());


        //search by key and by value - result is boolean
        System.out.println("Do we have Джан: " + MyDictionary.containsKey("Джан"));
        System.out.println("Do we have Иван: " + MyDictionary.containsKey("Иван"));
        System.out.println("Do we have 6.00: " + MyDictionary.containsValue(6.00));

         //(entry set)
        //for-each by entry set get-key and get-value
        for (Map.Entry<String, Double> items: MyDictionary.entrySet() ){
            System.out.printf("Person : %s has mark of : %.2f %n", items.getKey(), items.getValue());
            }

        //other
        System.out.println("MyHashMap entrySet: " + MyDictionary.entrySet());
        System.out.println("MyHashMap hashCode: " + MyDictionary.hashCode());
        System.out.println("MyHashMap getClass: " + MyDictionary.getClass());
    }
}