面向对象的好处: 通过封装,继承,多态把程序的耦合度降低. 用设计模式可以使程序更加灵活,容易修改,且易于复用. 1. 工厂方法模式 Define an interface for creating an object,but let subclasses decide which class to instantiate.Factory Method lets a class defer instantiation to subclasses. 定义:为创建对象定义一个接口,让子类决定实例化哪
作用:将实例的生成交给子类 用Template Method模式来构建生成实例的工厂,这就是Factory Method模式. 在Factory Method中,父类决定实例的生成方式,但并不决定所要生成的具体的类,具体的处理全部交给子类去负责 UML类图: Product类: public abstract class Product { public abstract void use(); } use方法的实现交给Product的子类 Factory类: public abstract c
Error creating bean with name 'mapper' defined in class path resource [applicationcontext.xml]: Cannot resolve reference to bean 'factory' while setting bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCrea
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'restHighLevelClient' defined in com.example.demo.MyHighLevelEsRestDemoApplication: Bean instantiation via factory method failed; nested exception is org.springfra
1.定义: 定义一个用于创建对象的接口,让子类决定实例化哪一个类.Factory Method使得一个类的实例化延迟到子类. 2.实现代码如下: /// <summary> /// 工厂方法 /// </summary> public abstract class Factory { public abstract Compute GetCompute(); } public class AddFactory : Factory { public override Compute