public class Url
{
private Url father_url = null;
private int current_depth = 0;
private Uri url_link ;
public Url(Uri url_link):this(null,0,url_link)
{
} public Url(Url father_url, int current_depth, Uri url_link)
{
this.father_url = father_url;
this.current_depth = current_depth;
this.url_link = url_link;
}
}
Url(Uri url_link):this(null,0,url_link)就是会自动调用另一个构造
Url(Url father_url, int current_depth, Uri url_link),传入参数为null,0,url_link