ТЕМА_16_CW

//ТЕМА_16 Работа в клас//

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

public class UASD_2_220321_CW {
    public static void main(String[] args) {
        Dictionary<Integer, String> MyDictionary = new Hashtable<>();
        //           KEY :  VALUE//

        // using PUT() method - to put element in//
        //              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");*/

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

        // FOR-EACH-CYCLE//
        // 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());
    }

}