java List的使用

public static void my_test() {
    String a = "A", b = "B", c = "C", d = "D", e = "E";
    List<String> list = new LinkedList<String>();
    list.add(a);
    list.add(e);
    list.add(d);
    list.set(1, b);// 将索引位置为1的对象e修改为对象b
    list.add(3, c);// 将对象c添加到索引位置为2的位置
    Iterator<String> it = list.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }

}