package chapter13;

public class DVDList {
    private DVDNode list;

    public DVDList()
    {
        list = null;
    }

    public void add(DVD dvd)
    {
        DVDNode node = new DVDNode(dvd);//把要加入的dvd弄成一个节点
        DVDNode current;//设置一个当前的节点

        if(list==null)
            list=node;//当list为空时，把dvd直接加上去
        else
        {
            current = list;
            while(current.next!=null)
                current=current.next;//直到找到下面一个节点为空的节点
            current.next=node;//把要加入的dvd加入到下一个为空的节点
        }
    }

    public String toString()
    {
        String result="";

        DVDNode current=list;

        while(current!=null)
        {
            result+=current.dvd.toString()+"\n";
            current=current.next;
        }
        return result;
    }
    public class DVDNode
    {
        DVD dvd;
        public  DVDNode next;

        public DVDNode(DVD dvd)
        {
            this.dvd=dvd;
            next=null;
        }
    }
}