package test;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.*;

public class ListTest {
    public static void main(String[] args) {
        LinkedList<Integer> list = new LinkedList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        Iterator<Integer> i = list.iterator();
        while (i.hasNext()) {
            Iterator<Integer> j = copyIterator(list, i);
            Integer x = i.next();
            if (j != null) {
                while (j.hasNext()) {
                    Integer y = j.next();
                    System.out.println(x + " " + y);
                }
            }
        }
    }

    private static <T> Iterator<T> copyIterator(LinkedList<T> list, Iterator<T> i) {
        try {
            Class<?> iteratorClass = i.getClass();
            Constructor<?> constructor = iteratorClass.getDeclaredConstructors()[0];
            constructor.setAccessible(true);
            Object result = constructor.newInstance(list, list.size());
            for (Field field : iteratorClass.getDeclaredFields()) {
                if (!Modifier.isFinal(field.getModifiers())) {
                    field.setAccessible(true);
                    field.set(result, field.get(i));
                }
            }
            @SuppressWarnings("unchecked") Iterator<T> resultIterator = (Iterator<T>) result;
            return resultIterator;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}