Interfejs_iterator

import java.util.Iterator; //interfejs Iterator
import java.util.ArrayList;

public class Main
{
    public static void main(String[] args)
    {
        //tworzymy tablice
        ArrayList<String> arr = new ArrayList<String>();

        //dodajemy elementy do tablicy
        arr.add("Jeden");
        arr.add("Dwa");
        arr.add("Trzy");
        arr.add("Cztery");

        //wyswietlamy zawartosc tablicy za pomoca petli for
        System.out.println("Zawartosc tablicy (petla while): ");
        //tworzymy iterator
        Iterator<String> iter = arr.iterator();
        while(iter.hasNext())
        {
            System.out.println(iter.next());
        }

        //wyswietlamy tablice za pomoca petli for each
        System.out.println("Zawartosc tablicy (petla for each): ");
        for(String element: arr)
        {
          System.out.println(element);
        }

        //usuwamy elementy z tablicy za pomoca iteratora
        String oo = "Jeden";
        System.out.println("Usuwam Jeden...");
        Iterator<String> iter1 = arr.iterator();
        while(iter1.hasNext())
        {
            Object o = iter1.next();
            if(o.equals(oo))
            {
                iter1.remove();
            }
        }

        //wyswietlamy zawartosc tablicy
        System.out.println("Zawartosc tablicy: ");
        for(String element: arr)
        {
            System.out.println(element);
        }

        //usuwamy wszystkie elementy
        System.out.println("Usuwam wszystkie elementy tablicy...");
        Iterator<String> iter3 = arr.iterator();
        while (iter3.hasNext())
        {
            iter3.next();
            iter3.remove();
        }

        //wyswietlamy zawartosc tablicy
        System.out.println("Zawartosc tablicy: ");
        for(String element: arr)
        {
            System.out.println(element);
        }

        System.out.println(oo.hashCode());
    }
}