import java.util.InputMismatchException;
import java.util.Scanner;

public class H6_main {

    public static void main(String [] args){

        ProductRepository sailio = new Hirsipuu();
        int valinta = 0;
        double hinta  = 0;
        String nimi;
        String arvaus;
        String syote;

        while(valinta < 10){
            Scanner sc = new Scanner(System.in);
            valinta = valinta + 1
            System.out.println("Arvaa kirjain :");
            arvaus = sc.nextLine();

        }


    }





    public static Product lueProduct(){
        Scanner sc = new Scanner(System.in);
        String nimi;

        System.out.print("Anna sana->");
        nimi = sc.nextLine();


        return new Product( nimi );

    }

    }
}

------------------------------------------------
import java.util.*;
import java.io.*;

class Hirsipuu implements Serializable{

    private Vector <Product> sailio;

    public Hirsipuu(){
        sailio = new Vector<>(3,1);
    }

    public void addProduct( Product prod ){
        sailio.addElement( prod );
    }

    public Product removeLast(){

        if(!sailio.isEmpty()){
            Product dProduct;
            dProduct = sailio.lastElement();
            int indeksi= sailio.lastIndexOf( dProduct );
            sailio.removeElementAt( indeksi );
            return dProduct;
        }
        return null;

    }

    public void tulosta(){

        Iterator<Product> iter = sailio.iterator();

        while( iter.hasNext()){
            System.out.println(iter.next());
        }

    }
    public boolean tallennaTiedostoon( String tiedostonNimi ){

        try (ObjectOutputStream oOut = new ObjectOutputStream( new FileOutputStream( tiedostonNimi ))){

            Iterator<Product> iter = sailio.iterator();

            while( iter.hasNext()){
                oOut.writeObject(iter.next());
            }

            return true;

        }catch( IOException ioe ){
            return false;
        }



    }

    public boolean lueTiedostosta( String tiedostonNimi ){

        try (ObjectInputStream oIn = new ObjectInputStream( new FileInputStream( tiedostonNimi ))){

            Product p =(Product)oIn.readObject();
            while ( p != null ){
                sailio.addElement( p );
                p =(Product)oIn.readObject();
            }


            return true;

        }catch( IOException | ClassNotFoundException e ){
            return false;
        }

    }
}

--------------------------------------------------

import java.io.*;

public class Sanalista implements Serializable{

    private String name;
    private double price;
    private int tuoteTunniste;


    public Product(final String name_par, final double price_par){
        this.name = name_par;
        this.price = price_par;
        this.tuoteTunniste = this.hashCode();
        System.out.println("Luotiin uusi olio: " + name + " hinta:" + price);
    }

    public void setName( final String name_par){
        this.name = name_par;
    }

    public String getName(){
        return this.name;
    }

    public void setPrice(final double price_par){
        this.price = price_par;
    }

    public double getPrice(){
        return this.price;
    }

   public String toString(){
      return "Tuotekoodi: "+ tuoteTunniste +"Tuote: " + this.name + " hinta: " + this.price;
   }
}