多态工厂

2019-11-06 07:51:30

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来源：转载

供稿：网友

参考《设计模式的艺术软件开发人员内功修炼之道》-刘伟著

实验目的

多态工厂将创建具体对象的任务交给子类实现；隐藏工厂方法，通过在工厂中实现对象的对外接口，达到对业务逻辑屏蔽对象的目的。

实验代码

/***************** Factory Method Pattern *********************/package PolymorphicFactory;interface Logger { public void doLog();}class DBLogger implements Logger { public void doLog() { System.out.PRintln("DBLogger logging ..."); }}class FileLogger implements Logger { public void doLog() { System.out.println("FileLogger logging ..."); }}interface LoggerFactory { public Logger createLogger();}class DBLoggerFactory implements LoggerFactory { public Logger createLogger() { return new DBLogger(); }}class FileLoggerFactory implements LoggerFactory { public Logger createLogger() { return new FileLogger(); }}class Business { private Logger logger; private LoggerFactory loggerFactory; public Business() { loggerFactory = new DBLoggerFactory(); logger = loggerFactory.createLogger(); } public void DoWork() { logger.doLog(); }}/********************* HidenFactory ***********************/abstract class HidenFactory { public void doLog() { Logger logger = createLogger(); logger.doLog(); } abstract Logger createLogger();}class HidenDBFactory extends HidenFactory { @Override Logger createLogger() { // TODO Auto-generated method stub return new DBLogger(); }}class HidenFileFactory extends HidenFactory { @Override Logger createLogger() { // TODO Auto-generated method stub return new FileLogger(); }}public class PolymorphicFactoryTest { public static void main(String[] args) { // TODO Auto-generated method stub // PolymorphicFactory Business business = new Business(); business.DoWork(); // HiddenFactory HidenFactory hidenFactory = new HidenFileFactory(); hidenFactory.doLog(); }}