在此示例中，我们创建了`FactoryMaker`，负责返回`ElfKingdomFactory`或`OrcKingdomFactory`的实例。 * 客户可以使用`FactoryMaker`来创建所需的具体工厂，该工厂随后将生产不同的具体对象（军队，国王，城堡）。 * 在此示例中，我们还使用了一个枚举来参数化客户要求的王国工厂类型。（这里使用了[工厂方法模式](Factory)） */ @Slf4j public class App implements Runnable { private final Kingdom kingdom = new Kingdom(); public static void main(String[] args) { App app = new App(); app.run(); } @Override public void run() { LOGGER.info("精灵王国."); createKingdom(Kingdom.FactoryMaker.KingdomType.ELF); LOGGER.info(kingdom.getArmy().getDescription()); LOGGER.info(kingdom.getCastle().getDescription()); LOGGER.info(kingdom.getKing().getDescription()); LOGGER.info("兽人王国."); createKingdom(Kingdom.FactoryMaker.KingdomType.ORC); LOGGER.info(kingdom.getArmy().getDescription()); LOGGER.info(kingdom.getCastle().getDescription()); LOGGER.info(kingdom.getKing().getDescription()); } /** * Creates kingdom. * @param kingdomType type of Kingdom */ public void createKingdom(final Kingdom.FactoryMaker.KingdomType kingdomType) { final KingdomFactory kingdomFactory = Kingdom.FactoryMaker.makeFactory(kingdomType); kingdom.setKing(kingdomFactory.createKing()); kingdom.setCastle(kingdomFactory.createCastle()); kingdom.setArmy(kingdomFactory.createArmy()); } }