关于最基础的工厂的模式，究竟这种设计模式有什么优势呢？解决办法

import static MyTools.Print.*;interface Service {  void method1();  void method2();}interface ServiceFactory {  Service getService();}class Implementation1 implements Service {  Implementation1() {}   public void method1() {print("Implementation1 method1");}  public void method2() {print("Implementation1 method2");}}    class Implementation1Factory implements ServiceFactory {  public Service getService() {    return new Implementation1();  }}class Implementation2 implements Service {  Implementation2() {}  public void method1() {print("Implementation2 method1");}  public void method2() {print("Implementation2 method2");}}class Implementation2Factory implements ServiceFactory {  public Service getService() {    return new Implementation2();  }}    public class Factories {  public static void serviceConsumer(ServiceFactory fact) {    Service s = fact.getService();    s.method1();    s.method2();  }  public static void main(String[] args) {    serviceConsumer(new Implementation1Factory());    serviceConsumer(new Implementation2Factory());  }}