工厂模式介绍
简单工厂
以下我们用支付场景演示简单工厂用法
1.定义支付接口
/**
* 支付接口
*
* @author Lion Li
*/
public interface IPay {
void payment();
}
2.编写工厂实例
/**
* 付款方式工厂
*
* @author Lion Li
*/
public class PayFactory {
/**
* 创建付款实例
* Class<? extends IPay> 单一原则 限制必须是 IPay 的子类
*/
public IPay create(Class<? extends IPay> clazz) {
if (null != clazz) {
try {
return clazz.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return null;
}
}
3.编写具体的支付类 例如: 微信 支付宝
/**
* 微信支付
*
* @author Lion Li
*/
public class WxPay implements IPay {
public void payment() {
System.out.println("微信支付");
}
}
/**
* 支付宝支付
*
* @author Lion Li
*/
public class ZfbPay implements IPay {
public void payment() {
System.out.println("支付宝支付");
}
}
4.编写测试类并运行测试
/**
* @author Lion Li
*/
public class Test {
public static void main(String[] args) {
IPay wx = new PayFactory().create(WxPay.class);
IPay zfb = new PayFactory().create(ZfbPay.class);
wx.payment();
zfb.payment();
}
}
工厂方法模式
以下我们用汽车场景工厂方法模式用法
1.定义汽车接口规范
/**
* 汽车接口规范
*
* @author Lion Li
*/
public interface ICar {
void name();
}
2.编写汽车工厂接口规范
/**
* 汽车工厂接口规范
*
* @author Lion Li
*/
public interface ICarFactory {
ICar create();
}
3.编写具体的汽车种类 例如: 宝马 大众
/**
* 宝马汽车
*
* @author Lion Li
*/
public class BaoMaCar implements ICar {
public void name() {
System.out.println("我是宝马");
}
}
/**
* 大众汽车
*
* @author Lion Li
*/
public class DaZhongCar implements ICar {
public void name() {
System.out.println("我是大众");
}
}
4.编写具体的汽车工厂 例如: 宝马工厂 大众工厂
/**
* 宝马汽车工厂
*
* @author Lion Li
*/
public class BaoMaCarFactory implements ICarFactory {
public ICar create() {
return new BaoMaCar();
}
}
/**
* 大众汽车工厂
*
* @author Lion Li
*/
public class DaZhongCarFactory implements ICarFactory {
public ICar create() {
return new DaZhongCar();
}
}
5.编写测试类并运行测试
/**
* @author Lion Li
*/
public class Test {
public static void main(String[] args){
ICarFactory baomaFactory = new BaoMaCarFactory();
ICar baoma = baomaFactory.create();
baoma.name();
ICarFactory dazhongFactory = new DaZhongCarFactory();
ICar dazhong = dazhongFactory.create();
dazhong.name();
}
}
抽象工厂
以下我们用多种出行方式来演示抽象工厂用法
1.定义产品接口规范
/**
* 汽车接口规范
*
* @author Lion Li
*/
public interface ICar {
void name();
}
/**
* 飞机接口规范
*
* @author Lion Li
*/
public interface IAircraft {
void name();
}
2.定义产品工厂接口规范
/**
* 汽车工厂接口规范
*
* @author Lion Li
*/
public interface ICarFactory {
ICar create();
}
/**
* 飞机工厂接口规范
*
* @author Lion Li
*/
public interface IAircraftFactory {
IAircraft create();
}
3.定义所有产品实现
/**
* 宝马汽车
*
* @author Lion Li
*/
public class BaoMaCar implements ICar {
public void name() {
System.out.println("我是宝马");
}
}
/**
* 大众汽车
*
* @author Lion Li
*/
public class DaZhongCar implements ICar {
public void name() {
System.out.println("我是大众");
}
}
/**
* 波音飞机
*
* @author Lion Li
*/
public class BoYinAircraft implements IAircraft {
public void name() {
System.out.println("我是波音");
}
}
/**
* 空客飞机
*
* @author Lion Li
*/
public class KongKeAircraft implements IAircraft {
public void name() {
System.out.println("我是空客");
}
}
4.定义所有产品工厂实现
/**
* 宝马汽车工厂
*
* @author Lion Li
*/
public class BaoMaCarFactory implements ICarFactory {
public ICar create() {
return new BaoMaCar();
}
}
/**
* 大众汽车工厂
*
* @author Lion Li
*/
public class DaZhongCarFactory implements ICarFactory {
public ICar create() {
return new DaZhongCar();
}
}
/**
* 波音飞机工厂
*
* @author Lion Li
*/
public class BoYinAircraftFactory implements IAircraftFactory {
public IAircraft create() {
return new BoYinAircraft();
}
}
/**
* 空客飞机工厂
*
* @author Lion Li
*/
public class KongKeAircraftFactory implements IAircraftFactory {
public IAircraft create() {
return new KongKeAircraft();
}
}
5.定义交通工具抽象工厂
/**
* 交通工具抽象工厂
*
* @author Lion Li
*/
public abstract class TransportationFactory {
public void init() {
System.out.println("初始化数据");
}
protected abstract ICar createCar(Class<? extends ICarFactory> clazz);
protected abstract IAircraft createAircraft(Class<? extends IAircraftFactory> clazz);
}
6.定义出行方式工厂
/**
* 出行方式工厂
*
* @author Lion Li
*/
public class TravelFactory extends TransportationFactory {
@Override
protected ICar createCar(Class<? extends ICarFactory> clazz) {
super.init();
if (null != clazz) {
try {
return clazz.newInstance().create();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return null;
}
@Override
protected IAircraft createAircraft(Class<? extends IAircraftFactory> clazz) {
super.init();
if (null != clazz) {
try {
return clazz.newInstance().create();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return null;
}
}
7.编写测试类并运行测试
/**
* @author Lion Li
*/
public class Test {
public static void main(String[] args){
TransportationFactory factory = new TravelFactory();
ICar baoma = factory.createCar(BaoMaCarFactory.class);
baoma.name();
ICar dazhong = factory.createCar(DaZhongCarFactory.class);
dazhong.name();
IAircraft boyin = factory.createAircraft(BoYinAircraftFactory.class);
boyin.name();
IAircraft kongke = factory.createAircraft(KongKeAircraftFactory.class);
kongke.name();
}
}
Spring 工厂 BeanFactory 解析
这里由于网上已经有很多成熟的解析文档 就不多做介绍了
推荐文章链接: Spring 的工厂模式 BeanFactory 是什么源码刨析