package iteratorrr;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Random;

class Lista implements Iterable<Double>{

    ArrayList<Double> iter = new ArrayList<Double>();
    Lista (){
        Random r = new Random();
        for (int i=0; i<10; i++){
            iter.add(r.nextDouble()%10);
        }
    }
    public String toString(){
        return iter + " ";
    }
    class ITERATOR implements Iterator<Double>{
        int przod =0;
        int tyl =iter.size()-1;
        int ile =0;
        @Override
        public boolean hasNext() {
            return ile<iter.size();
        }

        @Override
        public Double next() {
           if(ile%2==0){
               ile++;
               return iter.get(przod++);}
           else{
               ile++;
               return iter.get(tyl--);
           }
        }

    }

@Override
    public Iterator<Double> iterator() {
        return new ITERATOR();
    }}
public class Iteratorrr {


    public static void main(String[] args) {
        Lista L = new Lista();
        System.out.println(L);

        for (Double i : L) {
            System.out.print(i + ", ");
        }

    }

}