class Duilie{
    private LinkedList link;
    Duilie(){
        link = new LinkedList();
    }
    public void myAdd(Object obj){
        link.addFirst(obj);
    }
    public Object myGet(){
        return link.removeLast();//改為removeLast這樣就可以是堆棧和隊列的轉換
    }
    public boolean isNull(){
        return link.isEmpty();
    }
}
public class LinkedListTest {
    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());
        }
    }

}