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public interface Iterator<E> {    boolean hasNext();        E next();     default void remove() {        throw new UnsupportedOperationException("remove");    }       default void forEachRemaining(Consumer<? super E> action) {        Objects.requireNonNull(action);        while (hasNext())            action.accept(next());    }}

  private class Itr implements Iterator<E> {        /**元素的下標(biāo)         * Index of element to be returned by subsequent call to next.         */        int cursor = 0;        /**上一個(gè)元素的下標(biāo)。如果元素已被刪除就設(shè)置為-1         * Index of element returned by most recent call to next or         * previous.  Reset to -1 if this element is deleted by a call         * to remove.         */        int lastRet = -1;        /**允許修改的次數(shù)，違規(guī)操作會(huì)拋異常         * The modCount value that the iterator believes that the backing         * List should have.  If this expectation is violated, the iterator         * has detected concurrent modification.         */        int expectedModCount = modCount;       /*檢查是否還有下一個(gè)元素*/        public boolean hasNext() {            return cursor != size();        }      /*光標(biāo)下移，并且返回當(dāng)前的元素*/        public E next() {            checkForComodification();            try {                int i = cursor;                E next = get(i);                lastRet = i;                cursor = i + 1;                return next;            } catch (IndexOutOfBoundsException e) {                checkForComodification();                throw new NoSuchElementException();            }        }       /*移除元素*/        public void remove() {            if (lastRet < 0)                throw new IllegalStateException();            checkForComodification();            try {                AbstractList.this.remove(lastRet);                if (lastRet < cursor)                    cursor--;                lastRet = -1;                expectedModCount = modCount;            } catch (IndexOutOfBoundsException e) {                throw new ConcurrentModificationException();            }        }        final void checkForComodification() {            if (modCount != expectedModCount)                throw new ConcurrentModificationException();        }    }

    public Iterator<E> iterator() {        return new Itr();    }

        List<String> list=new ArrayList<String>();        list.add("apple"); list.add("banana"); list.add("watermelon");        for (Iterator<String> iterator=list.iterator();iterator.hasNext();) {            System.out.println( iterator.next());
       }