Hashtable Lab

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package lab6_fileReadWrite;

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

/**
 *
 * @author acer
 */
public class hashTableIntro {

    public static void main(String[] args) {

        Hashtable <String,String> stds=new Hashtable<String,String>();
        Hashtable <Integer,String> stds2;

        stds.put("One","A");
        stds.put("One", "newA");
        stds.put("Two", "B");


        System.out.println(stds);
        System.out.println("hash code is : "+stds.hashCode());

        System.out.println("------------GET----------");
             System.out.println("A's val "+stds.get("One"));

             System.out.println("if hash set contains newA "+stds.contains("newA"));

             Hashtable <Integer,String> stds1=new Hashtable<Integer,String>();

              System.out.println("------------CLEAR----------");

        stds1.put(1,"A");
        stds1.put(2, "B");
        stds1.put(3, "C");
        stds2 = (Hashtable<Integer, String>)stds1.clone();

        System.out.println("new set std1 "+stds1);
        stds1.clear();
        System.out.println("Empy after clear "+stds1);

        System.out.println("--------------------Contains val and key-------------");
        System.out.println("contains val newA "+stds.containsValue("newA"));
        System.out.println("contains key One "+stds.containsKey("One"));

        System.out.println("--------------------ToString-------------");
        System.out.println("String hashTable"+stds.toString());

        System.out.println("-------------------Clone-------------");
        System.out.println(stds.clone());
        System.out.println(stds2);

        System.out.println("------------Size of stds1 table----------");
        System.out.println("The size of the stds table is " +
        stds.size());
        System.out.println("The size of the STDS2 table is " +
        stds2.size());
        System.out.println("The size of the 'cleared' STDS1 table is " +
        stds1.size());

        System.out.println("--------------------KEYS-------------");
        Enumeration enu = stds.keys();

        System.out.println("The enumeration of keys are:");


        // Displaying the Enumeration
        while (enu.hasMoreElements()) {
            System.out.println(enu.nextElement());
        }

        System.out.println("------------Compute used for UPDATE--------------");
        Hashtable<String, Integer> table = new Hashtable<>();
        table.put("Pen", 10);
        table.put("Book", 500);
        table.put("Clothes", 400);
        table.put("Mobile", 5000);

        // print map details
        System.out.println("hashTable: " + table.toString());

        // remap the values of hashTable
        // using compute method
        table.compute("Pen", (key, val)
                                 -> val + 15);
        table.compute("Clothes", (key, val)
                                     -> val - 120);

        // print new mapping
        System.out.println("new hashTable: " + table);
    }
}