Title 16 exercise in class

import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;

public class dictionary {
    public static void main(String[] args) {
        Dictionary<Integer,String> MyDictionary = new Hashtable<>(16);
        //              key : value
        MyDictionary.put(1,"Apple");
        MyDictionary.put(2,"Banana");
        MyDictionary.put(3,"Orange");
        MyDictionary.put(4,"Avocado");

        // PRINT MyDictionary BEFORE removing elements
        System.out.println();
        System.out.println("BEFORE removing elements: " + MyDictionary.size());
        System.out.println();

        // print SIZE() of dictionary BEFORE REMOVING ELEMENTS ..................................
        System.out.println("\nSize of my_dict BEFORE removing elements : " + MyDictionary.size());
        System.out.println();


        // using GET() method, when the key is INTEGER ...........................................
        System.out.println("Value at key = 1 : " + MyDictionary.get(1));
        System.out.println("Value at key = 2 : " + MyDictionary.get(2));
        System.out.println("Value at key = 3 : " + MyDictionary.get(3));
        System.out.println("Value at key = 4 : " + MyDictionary.get(4));
        System.out.println();

        // using GET() method, when the key is STRING.............................................
        /*
        System.out.println("Value at key = AP : " + MyDictionary.get("AP"));
        System.out.println("Value at key = BA : " + MyDictionary.get("BA"));
        System.out.println("Value at key = OR : " + MyDictionary.get("OR"));
        System.out.println("Value at key = AV : " + MyDictionary.get("AV"));
        System.out.println();
*/



        // PRINT BY FOR-CYCLE ITERATION WHEN KEY IS INTEGER
        System.out.println("By FOR-CYCLE :");
        for (int i = 1; i <= MyDictionary.size(); i++) {

            System.out.println("MyDict element : " + MyDictionary.get(i));

        }

        System.out.println();



        // FOR-EACH-CYCLE ::::::::::::::::: HASH-TABLE
        // PRINT KEYS BY ENUMERATOR USING KEYS() METHOD...................................................
        System.out.println("By Enumeration - KEYS :");
        for (Enumeration items = MyDictionary.keys(); items.hasMoreElements();)
        {
            System.out.println("KEYS in Dictionary : " + items.nextElement());
            //System.out.println(items.asIterator());
        }
        System.out.println();

        // FOR-EACH-CYCLE ::::::::::::::::: HASH-TABLE
        // PRINT VALUES (ELEMENTS) BY ENUMERATOR USING ELEMENTS() METHOD....................................................
        System.out.println("By Enumeration - VALUES :");
        for (Enumeration items = MyDictionary.elements(); items.hasMoreElements();)
        {
            System.out.println("VALUES in Dictionary : " + items.nextElement());
        }
        System.out.println();

        // using isEmpty() method..............................................................
        System.out.println("\nIs my dictionary empty? : " + MyDictionary.isEmpty());
        System.out.println();


        // using REMOVE() method...............................................................
        // remove value by Integer key 1 and key 2
        MyDictionary.remove(1);
        MyDictionary.remove(2);
        System.out.println();

        // remove value by String key-"BA" and key-"AV"
        MyDictionary.remove("BA");
        MyDictionary.remove("AV");
        System.out.println();


        // CHECK  BY INTEGER-KEY IF THE ELEMENTS ARE REMOVED
        System.out.println("Checking if the removed value exists (by integer key) : " + MyDictionary.get(1));
        System.out.println("Checking if the removed value exists (by integer key) : " + MyDictionary.get(2));
        System.out.println("Checking if the removed value exists (by integer key) : " + MyDictionary.get(3));
        System.out.println();

        // CHECK  BY STRING-KEY IF THE ELEMENTS ARE REMOVED
        System.out.println("Checking if the removed value exists (by string key) : " + MyDictionary.get("BA"));
        System.out.println("Checking if the removed value exists (by string key) : " + MyDictionary.get("AV"));
        System.out.println("Checking if the removed value exists (by string key) : " + MyDictionary.get("AP"));
        System.out.println();



        // print after removing elements
        System.out.println("AFTER removing elements : " + MyDictionary);
        System.out.println();


        // using size() method.................................................................
        System.out.println("\nSize of my_dict AFTER removing elements : " + MyDictionary.size());
    }
}