// 产品基因库
interface Truck {void deliver(); // 所有卡车的统一动作
}// 具体产品型号
class ChineseTruck implements Truck {public void deliver() { System.out.println("中国重卡驰骋于G7京新高速"); }
}

// 工厂基因组
interface TruckFactory {Truck createTruck(); // 抽象工厂方法
}// 中国分厂实现
class ChineseTruckFactory implements TruckFactory {public Truck createTruck() { return new ChineseTruck(); // 具体生产流程}
}

abstract class LogisticsCompany {// 工厂方法本体（可提供默认实现）public abstract Truck orderTruck();// 业务模板方法public void planDelivery() {Truck truck = orderTruck();truck.deliver();}
}// 欧洲分公司
class EuropeLogistics extends LogisticsCompany {@Overridepublic Truck orderTruck() {return new EuropeanTruck();}
}

interface CloudLogistics {// 静态工厂方法（JDK8+特性）static Truck createTruck(Region region) {return switch (region) {case ASIA -> new ChineseTruck();case EUROPE -> new EuropeanTruck();case MID_EAST -> new SaudiTruck();};}
}// 调用示例
Truck dubaiTruck = CloudLogistics.createTruck(Region.MID_EAST);

class UniversalFactory {// 通过类名动态生成public static <T extends Truck> T createTruck(Class<T> clazz) {try {return clazz.getDeclaredConstructor().newInstance();} catch (Exception e) {throw new RuntimeException("生成失败", e);}}
}// 动态创建实例
Truck truck = UniversalFactory.createTruck(ChineseTruck.class);

// 工厂方法即函数
public class LambdaFactory {private final Supplier<Truck> constructor;public LambdaFactory(Supplier<Truck> constructor) {this.constructor = constructor;}public Truck produce() {return constructor.get();}
}// 使用示例
LambdaFactory factory = new LambdaFactory(ChineseTruck::new);
Truck truck = factory.produce();

enum CountryFactory {CHINA {public Truck create() { return new ChineseTruck(); }},UK {public Truck create() { return new BritishTruck(); }};public abstract Truck create();
}// 枚举调用
Truck londonTruck = CountryFactory.UK.create();

abstract class SmartFactory {// 模板方法定义流程public final Truck manufacturing() {Truck truck = createTruck();qualityCheck(truck);registerTracking(truck);return truck;}protected abstract Truck createTruck();private void qualityCheck(Truck t) { /*...*/ }private void registerTracking(Truck t) { /*...*/ }
}

class RecyclableTruckFactory implements TruckFactory {private final Queue<Truck> pool = new LinkedList<>();public Truck createTruck() {if (pool.isEmpty()) {return new ChineseTruck(); }return pool.poll().reset(); // 重用对象}public void recycle(Truck truck) {pool.offer(truck);}
}

class SafeTruckFactory implements TruckFactory {public Truck createTruck() {try {return doCreate();} catch (PartsMissingException e) {return new EmergencyTruck(); // 降级处理}}private Truck doCreate() throws PartsMissingException {// 可能抛出异常的实际创建过程}
}

@Configuration
public class FactoryConfig {@Bean@Scope("prototype")public Truck chineseTruck() {return new ChineseTruck();}@Beanpublic TruckFactory truckFactory() {return region -> {// 根据区域返回不同Beanreturn applicationContext.getBean(region.name() + "Truck");};}
}// 在Controller中自动装配
@Autowired 
private TruckFactory truckFactory;