声明:本栏目所使用的素材都是凯哥学堂VIP学员所写,学员有权匿名,对文章有最终解释权;凯哥学堂旨在促进VIP学员互相学习的基础上公开笔记。 一.接口 1.接口只做规范和声明不做实现; 2.java中类只能单一继承,不能多继承,但是接口可以多继承; 3.接口不要从功能上去看,不要觉得接口会带来功能上得提升,只能从设计角度去看待,从长远角度去看待,给我们带来得是规范,让我们更好得面向父类编程,这就是接口得魅力。 ![image](http://os78f4hny.bkt.clouddn.com/201807260001.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
4.接口就是一个类,就是一个抽象类,编译之后仍然是class文件。写法也是纯抽象类得写法。 ![image](http://os78f4hny.bkt.clouddn.com/201807260002.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260003.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260004.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260005.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
5.接口的继承问题 ![image](http://os78f4hny.bkt.clouddn.com/201807260006.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
接口不可以继承类或者抽象类; 接口可以继承接口可以继承更多的接口。 6.类可以实现接口,接口却不可以继承类。 ![image](http://os78f4hny.bkt.clouddn.com/201807260007.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260008.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260009.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
按顺序来说,继承在前面,接口放在后面。 实现多个接口,只需要在接口和接口之间用逗号(,)隔开即可。 7.从设计角度讲:万事万物皆接口。 不要对实现类产生依赖,容易不好扩展和升级,我们需要得是很容易得升级和扩展,所以我们要面向接口编程,也就是面向父类编程,让实现类去实现这些方法,然后用这些实现类就可以了。 8.注意 申请了接口一定要面向接口编程。 就是申请了接口一点要面向接口编程,也就相当于面向父类编程。 二.简单工厂设计模式 ![image](http://os78f4hny.bkt.clouddn.com/201807260010.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
1.创建型设计模式; 2.也是为了创建对象; 3.目的是如何将实现类隐藏起来,不会被发现。 ![image](http://os78f4hny.bkt.clouddn.com/201807260011.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
4.例题: ![image](http://os78f4hny.bkt.clouddn.com/201807260012.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260013.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260014.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260015.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260016.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
这样功能就可以达到升级的目的。 ![image](http://os78f4hny.bkt.clouddn.com/201807260017.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
![image](http://os78f4hny.bkt.clouddn.com/201807260018.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
如果接口跟工厂联系到一起,书面上会把接口称之为产品接口,在这里创建出来的就是售票员产品,我们要做的就是一定要把对象隐藏起来不被别人看见,如果被人发现就不能称之为工厂方法。 工厂的目的就是隐藏对象创建,隐藏对象的原因就是要很好的更换子类,要很好的修改子类!!!! ![image](http://os78f4hny.bkt.clouddn.com/201807260019.jpg?imageMogr2/blur/1x0/quality/75%7Cwatermark/1/image/aHR0cDovL29zNzhmNGhueS5ia3QuY2xvdWRkbi5jb20vd2F0ZXJtYXJrLnBuZw==/dissolve/50/gravity/SouthEast/dx/10/dy/10%7Cimageslim)
|