java 迭代器iterator

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對於如ArrayList<E>類的資料，常用iterator遍曆。

    ArrayList<String> list = new ArrayList<String>();        list.add("1");        list.add("2");        list.add("3");        Iterator<String> iterator = list.iterator();        for(;iterator.hasNext();){            String aString = iterator.next();            System.out.println(aString);            if(aString=="1"){                iterator.remove();            }        }        iterator = list.iterator();        for(;iterator.hasNext();){            String aString = iterator.next();            System.out.println(aString);        }

注意的是：

    /**     * Returns an iterator over the elements in this list in proper sequence.     *     * <p>The returned iterator is <a href="#fail-fast"><i>fail-fast</i></a>.     *     * @return an iterator over the elements in this list in proper sequence     */    public Iterator<E> iterator() {        return new Itr();    }

 

java 迭代器iterator