public class Demo {
  public static void main(String[] args) {
    ArrayList<String> list = new ArrayList<String>();
    list.add("A");
    list.add("B");
    list.add("C");
    
    System.out.println("........第一种遍历方式：for遍历......");
    for (Object li : list) {
      System.out.println(li);
    }
    
    System.out.println("........第二种遍历方式：ListIterator迭代遍历......");
    ListIterator<String> it = list.listIterator();
    while (it.hasNext()) {
      Object obj = it.next();
      System.out.println(obj);
    }
  }
}

class Duilie{
  private LinkedList<Object> link;
  Duilie(){
    link = new LinkedList<Object>();
  }
  public void myAdd(Object obj){
    link.addFirst(obj);
   }
  public Object myGet(){
    return link.removeLast();//先进先出---若要改成先进后出，将removelast()改成removeFirst（）
  }
  public boolean isNull(){
    return link.isEmpty();
  }
}
public class Demo2 {
  public static void main(String[] args) {
    Duilie dl = new Duilie();
    dl.myAdd("java01");
    dl.myAdd("java02");
    dl.myAdd("java03");
    dl.myAdd("java04");
    while(!dl.isNull()){
      System.out.println(dl.myGet());
    }
  }
}