iterator的使用

所有的集合都有iterator方法；

public static void main(String[] args) {        // TODO Auto-generated method stub        ArrayList<String> alt = new ArrayList<String>();        alt.add("1");        alt.add("2");        alt.add("3");        Iterator altor = alt.iterator();        System.out.print("altor通过迭代器：");        while (altor.hasNext()) {            System.out.print("\t" + altor.next());        }        LinkedList<String> lls = new LinkedList<String>();        Iterator lltor = alt.iterator();        System.out.print("\nlltor通过迭代器：");        while (lltor.hasNext()) {            System.out.print("\t" + lltor.next());        }    }运行结果：     altor通过迭代器：    1    2    3     lltor通过迭代器：    1    2    3