java实现的注册工厂模式

package com.eric.reflect;import java.util.ArrayList;import java.util.Random;/* * factory interface * */interface Factory<T> {public T create();}public class RegisterFactory {public static void main(String[] args) {System.out.println(Part.randomPart());}}class Part {private static ArrayList<Factory<? extends Part>> factoryList = new ArrayList<Factory<? extends Part>>();/* * registry all factory in factoryList when initialize class * */static {factoryList.add(new AirFilter().new AirFilterFactory());factoryList.add(new CabinFilter().new CabinFilterFactory());factoryList.add(new CabinBelt().new CabinBeltFactory());factoryList.add(new AirBelt().new AirBeltFactory());}public static Part randomPart() {return factoryList.get(new Random().nextInt(factoryList.size())).create();}@Overridepublic String toString() {return getClass().getSimpleName();}}class Filter extends Part {}class Belt extends Part {}class AirBelt extends Belt {class AirBeltFactory implements Factory<AirBelt> {public AirBelt create() {return new AirBelt();}}}class CabinBelt extends Belt {class CabinBeltFactory implements Factory<CabinBelt> {public CabinBelt create() {return new CabinBelt();}}}class AirFilter extends Filter {class AirFilterFactory implements Factory<AirFilter> {public AirFilter create() {return new AirFilter();}}}class CabinFilter extends Filter {class CabinFilterFactory implements Factory<CabinFilter> {public CabinFilter create() {return new CabinFilter();}}}/* *  * History: *  *  *  * $Log: $ */