1子类和父类实现同样的接口,这样做有什么意义吗? 举例:Vector和AbstractList的类签名 public class Vector<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable public abstract class AbstractList<E> extends AbstractCollection&l…
问题1:in include 'provide the namespace argument to include() instead 描述:在最外层的urls.py 添加项目的urls后报错,错误显示:in include 'provide the namespace argument to include() instead." 解决方案: 修改:url(r'admin/',include(admin.site.urls)) 为 url(r'admin/',admin.site.urls)…