工厂

工厂：简单，工厂，抽象

生成遵循接口的对象，抽象与实现分离，替换新的实现时，不修改代码

package designpattern;public class FactoryContext {public static void main(String[] args) {Service s1 = FactoryContext.getService(new Service1Factory());s1.update1();s1.update2();System.out.println("------------");Service s2 = FactoryContext.getService(new Service2Factory());s2.update1();s2.update2();}public static Service getService(ServiceFactory sf) {return sf.getService();}}interface Service {void update1();void update2();}interface ServiceFactory {Service getService(); }class Service1 implements Service {@Overridepublic void update1() {System.out.println("Service1.update1()");}@Overridepublic void update2() {System.out.println("Service1.update2()");}}class Service2 implements Service {@Overridepublic void update1() {System.out.println("Service2.update1()");}@Overridepublic void update2() {System.out.println("Service2.update2()");}}class Service1Factory implements ServiceFactory {@Overridepublic Service getService() {return new Service1();}}class Service2Factory implements ServiceFactory {@Overridepublic Service getService() {return new Service2();}}