03二十三種設計模式之抽象工廠模式

二十三種設計模式之抽象工廠模式

抽象工廠模式

用于生産不同産品族的全部産品（對于增加新的産品，無能為力，支援增加産品族）

抽象工廠模式是對同種業務，不同情況

應用場景

• JDK 中 Calendar 的 getInstance() 方法
• JDBC 中 Connection 對象的擷取
• Spring 中 IOC 容器建立管理 Bean 對象
• XML 解析時的 DocumentBuiulderFactory 建立解析器對象
• 反射中 Class 對象的 newInstance()

優勢劣勢

Engine 接口及其實作類

package factory.abstra;
/**
 * @author SIMBA1949
 * @date 2019/6/6 11:21
 */
public interface Engine {
    void speedRatio();
}
class LowEngine implements Engine{
    public void speedRatio() {
  System.out.println("低端引擎，轉速慢");
    }
}
class LuxuryEngine implements Engine{
    public void speedRatio() {
  System.out.println("高端引擎，轉速快");
    }
}      

Seat 接口及其實作類

package factory.abstra;
/**
 * @author SIMBA1949
 * @date 2019/6/6 11:22
 */
public interface Seat {
    void function();
}
class LowSeat implements Seat{
    public void function() {
  System.out.println("低端座椅");
    }
}
class LuxurySeat implements Seat{
    public void function() {
  System.out.println("高端座椅");
    }
}      

Tire 接口及其實作類

package factory.abstra;
/**
 * @author SIMBA1949
 * @date 2019/6/6 11:22
 */
public interface Tire {
    void durability();
}
class LowTire implements Tire{
    public void durability() {
  System.out.println("低端輪胎");
    }
}
class LuxuryTire implements Tire{
    public void durability() {
  System.out.println("高端輪胎");
    }
}      

抽象工廠 及其實作類

package factory.abstra;
/**
 * @author SIMBA1949
 * @date 2019/6/6 11:26
 */
public interface ProductsFactory {
    Engine createEngine();
    Seat createSeat();
    Tire createTire();
}
class LowProductFactory implements ProductsFactory {
    public Engine createEngine() {
  return new LowEngine();
    }
    public Seat createSeat() {
  return new LowSeat();
    }
    public Tire createTire() {
  return new LowTire();
    }
}
class LuxuryProductFactory implements ProductsFactory {
    public Engine createEngine() {
  return new LuxuryEngine();
    }
    public Seat createSeat() {
  return new LuxurySeat();
    }
    public Tire createTire() {
  return new LuxuryTire();
    }
}      

Client 測試

package factory.abstra;
/**
 * @author SIMBA1949
 * @date 2019/6/6 11:29
 */
public class AbstractFactoryClient {
    public static void main(String[] args) {
  Engine lowEngine = new LowProductFactory().createEngine();
  Seat lowSeat = new LowProductFactory().createSeat();
  Tire lowTire = new LowProductFactory().createTire();
  Engine luxuryEnginer = new LuxuryProductFactory().createEngine();
  Seat luxurySeat = new LuxuryProductFactory().createSeat();
  Tire luxuryTire = new LuxuryProductFactory().createTire();
    }
}