AbstractFactory 抽象工厂

概述

提供一个创建一系列相关或相互依赖对象的接口,而无需指定它们具体的类。

适用性

  1. 一个系统要独立于它的产品的创建、组合和表示时
  2. 一个系统要由多个产品系列中的一个来配置时
  3. 当你要强调一系列相关的产品对象的设计以便进行联合使用时
  4. 当你提供一个产品类库,而只想显示它们的接口而不是实现时

参与者

  1. AbstractFactory 声明一个创建抽象产品对象的操作接口
  2. ConcreteFactory 实现创建具体产品对象的操作
  3. AbstractProduct 为一类产品对象声明一个接口
  4. ConcreteProduct 定义一个将被相应的具体工厂创建的产品对象。实现AbstractProduct接口
  5. ClientTest 仅使用由AbstractFactory和AbstractProduct类声明的接口

类图

例子

AbstractFactory

public interface IAnimalFactory {
    ICat createCat();
    IDog createDog();
}

ConcreteFactory

public class BlackAnimalFactory implements IAnimalFactory {
    public ICat createCat() {
        return new BlackCat();
    }
    public IDog createDog() {
        return new BlackDog();
    }
}
public class WhiteAnimalFactory implements IAnimalFactory {
    public ICat createCat() {
        return new WhiteCat();
    }
    public IDog createDog() {
        return new WhiteDog();
    }
}

AbstractProduct

public interface ICat {
    void eat();
}
public interface IDog {
    void eat();
}

ConcreteProduct

public class BlackCat implements ICat {
    public void eat() {
        System.out.println("The black cat is eating!");
    }
}
public class WhiteCat implements ICat {
    public void eat() {
        System.out.println("The white cat is eating!");
    }
}
public class BlackDog implements IDog {
    public void eat() {
        System.out.println("The black dog is eating");
    }
}
public class WhiteDog implements IDog {
    public void eat() {
        System.out.println("The white dog is eating!");
    }
}

ClientTest

public static void main(String[] args) {
    IAnimalFactory blackAnimalFactory = new BlackAnimalFactory();
    ICat blackCat = blackAnimalFactory.createCat();
    blackCat.eat();
    IDog blackDog = blackAnimalFactory.createDog();
    blackDog.eat();
    
    IAnimalFactory whiteAnimalFactory = new WhiteAnimalFactory();
    ICat whiteCat = whiteAnimalFactory.createCat();
    whiteCat.eat();
    IDog whiteDog = whiteAnimalFactory.createDog();
    whiteDog.eat();
}

结果

The black cat is eating!
The black dog is eating!
The white cat is eating!
The white dog is eating!

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