Class

package com.company;

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

public class Main {

    public static void main(String[] args) {

     Dictionary <String , String> MyDictionary = new Hashtable();


       // Използване PUT метода
        //               key : value

       /* MyDictionary.put(1,"Apple");
        MyDictionary.put(2,"Banana");
        MyDictionary.put(3,"Orange");
        MyDictionary.put(4,"Avocado"); */

            MyDictionary.put("AP","Apple");
            MyDictionary.put("BA","Banana");
            MyDictionary.put("OR","Orange");
            MyDictionary.put("AV","Avocado");

        // принтираме SIZE() на речника - преди да премахнем елементите

        System.out.println("\nSize of my_dict : " + MyDictionary.size());
        System.out.println();

        // използваме GET() метода
        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();

       // използваме GET() метода
       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"));

        //принтираме преди да премахнем

        System.out.println();
        System.out.println("Before removing elements : " + MyDictionary);
        System.out.println();

        // For - cycle
        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();


        // KEYS() метод == принтиране
        System.out.println("By Enumeration - KEYS :");
        for (Enumeration items  = MyDictionary.keys(); items.hasMoreElements();) {
            System.out.println("KEYS in Dictionary : " + items.nextElement());
        }
       System.out.println();


        //VALUE() метод == принтиране
        System.out.println("By Enumeration - VALUES :");
        for (Enumeration items  = MyDictionary.elements(); items.hasMoreElements();) {
            System.out.println("VALUE in Dictionary : " + items.nextElement());
        }
       System.out.println();

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

        // 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 1 and key 2
        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());
    }
}