【设计模式】4.工厂模式

工厂模式

（1）简单工厂模式

结构图：

public interface Phone {   // AbstractProduct
    void playgames();
}

public class HWPhone implements Phone{  // Product1
    @Override
    public void playgames() {
        System.out.println("HW手机玩游戏");
    }
}

public class MIPhone implements Phone {  // Product2
    @Override
    public void playgames() {
        System.out.println("MI手机玩游戏");
    }
}

public class SimplePhoneFactory {    // SimpleFactory 
    public Phone createHWPhone(){  // 生产HW手机
        return new HWPhone();
    }

    public Phone createMIPhone(){   // 生产MI手机
        return new MIPhone();
    }
}

public class Test {
    public static void main(String[] args) {
        SimplePhoneFactory simpleFactory = new SimplePhoneFactory();
        Phone hwphone = simpleFactory.createHWPhone();
        hwphone.playgames();
        Phone miphone = simpleFactory.createMIPhone();
        miphone.playgames();
    }
}

输出：

HW手机玩游戏
MI手机玩游戏

（2）工厂模式

　　简单工厂中，一个工厂生产不同品牌的手机，可以对工厂进行抽象，分成各自的工厂。

结构图：

public interface Phone {  // AbstractProduct
    void playgames();
}

public class HWPhone implements Phone{  // Product1
    @Override
    public void playgames() {
        System.out.println("HW手机玩游戏");
    }
}

public class MIPhone implements Phone {  // Product2
    @Override
    public void playgames() {
        System.out.println("MI手机玩游戏");
    }
}

public interface PhoneFactory {  // AbstractFactory
    Phone produce();
}

public class HWFactory implements PhoneFactory {  // Factory1
    @Override
    public Phone produce() {
        return new HWPhone();
    }
}

public class MIFactory implements PhoneFactory {  // Factory2
    @Override
    public Phone produce() {
        return new MIPhone();
    }
}

public class Test {
    public static void main(String[] args) {
        PhoneFactory hwphoneFactory = new HWFactory();
        HWPhone hwPhone = (HWPhone) hwphoneFactory.produce();
        hwPhone.playgames();

        PhoneFactory miphoneFactory = new MIFactory();
        MIPhone miPhone = (MIPhone)miphoneFactory.produce();
        miPhone.playgames();
    }
}

输出：

HW手机玩游戏
MI手机玩游戏

（3）抽象工厂

　　工厂模式只能生产一种产品，抽象工厂模式提供了一种方式，可以将同一品牌的各种产品单独的工厂封装起来。

结构图：

public interface Phone {  // AbstractProductA
    void playgames();
}

public class HWPhone implements Phone{  // ProductA1
    @Override
    public void playgames() {
        System.out.println("HW手机玩游戏");
    }
}

public class MIPhone implements Phone {  // ProductA2
    @Override
    public void playgames() {
        System.out.println("MI手机玩游戏");
    }
}

public interface Charger {   // AbstractProductB
    void charge();
}

public class HWCharger implements Charger{  // ProductB1
    @Override
    public void charge() {
        System.out.println("HW手机充电器");
    }
}

public class MICharger implements Charger {  // ProductB2
    @Override
    public void charge() {
        System.out.println("MI手机充电器");
    }
}

public interface PhoneFactory {   // AbstractFactory
    Phone producePhone();
    Charger produceCharger();
}

public class HWFactory implements PhoneFactory {  // Factory1
    @Override
    public Phone producePhone() {
        return new HWPhone();
    }

    @Override
    public Charger produceCharger() {
        return new HWCharger();
    }
}

public class MIFactory implements PhoneFactory {  // Factory2
    @Override
    public Phone producePhone() {
        return new MIPhone();
    }

    @Override
    public Charger produceCharger() {
        return new MICharger();
    }
}

public class Test {
    public static void main(String[] args) {
        PhoneFactory hwphoneFactory = new HWFactory();
        HWPhone hwPhone = (HWPhone) hwphoneFactory.producePhone();
        HWCharger hwCharger = (HWCharger)hwphoneFactory.produceCharger();
        hwPhone.playgames();
        hwCharger.charge();

        PhoneFactory miphoneFactory = new MIFactory();
        MIPhone miPhone = (MIPhone)miphoneFactory.producePhone();
        MICharger miCharger = (MICharger)miphoneFactory.produceCharger();
        miPhone.playgames();
        miCharger.charge();
    }
}

输出:

HW手机玩游戏
HW手机充电器
MI手机玩游戏
MI手机充电器