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    Java設計模式(九) 橋接模式

    原創文章,轉載請務必將下面這段話置于文章開頭處(保留超鏈接)。
    本文轉發自技術世界原文鏈接 http://www.luozeyang.com/design_pattern/bridge/

    橋接模式定義

    橋接模式(Bridge Pattern),將抽象部分與它的實現部分分離,使它們都可以獨立地變化。更容易理解的表述是:實現系統可從多種維度分類,橋接模式將各維度抽象出來,各維度獨立變化,之后可通過聚合,將各維度組合起來,減少了各維度間的耦合。

    例講橋接模式

    不必要的繼承導致類爆炸

    汽車可按品牌分(本例中只考慮BMT,BenZ,Land Rover),也可按手動檔、自動檔、手自一體來分。如果對于每一種車都實現一個具體類,則一共要實現3*3=9個類。

    使用繼承方式的類圖如下
    Bridge pattern inherit class diagram

    從上圖可以看到,對于每種組合都需要創建一個具體類,如果有N個維度,每個維度有M種變化,則需要$M^N$個具體類,類非常多,并且非常多的重復功能。

    如果某一維度,如Transmission多一種可能,比如手自一體檔(AMT),則需要增加3個類,BMWAMT,BenZAMT,LandRoverAMT。

    橋接模式類圖

    橋接模式類圖如下
    Bridge pattern class diagram

    從上圖可知,當把每個維度拆分開來,只需要M*N個類,并且由于每個維度獨立變化,基本不會出現重復代碼。

    此時如果增加手自一體檔,只需要增加一個AMT類即可

    橋接模式實例解析

    本文代碼可從作者Github下載

    抽象車

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    package com.jasongj.brand;

    import com.jasongj.transmission.Transmission;

    public abstract class AbstractCar {

    protected Transmission gear;

    public abstract void run();

    public void setTransmission(Transmission gear) {
    this.gear = gear;
    }

    }

    按品牌分,BMW牌車

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    package com.jasongj.brand;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class BMWCar extends AbstractCar{

    private static final Logger LOG = LoggerFactory.getLogger(BMWCar.class);

    @Override
    public void run() {
    gear.gear();
    LOG.info("BMW is running");
    };

    }

    BenZCar

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    package com.jasongj.brand;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class BenZCar extends AbstractCar{

    private static final Logger LOG = LoggerFactory.getLogger(BenZCar.class);

    @Override
    public void run() {
    gear.gear();
    LOG.info("BenZCar is running");
    };

    }

    LandRoverCar

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    package com.jasongj.brand;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class LandRoverCar extends AbstractCar{

    private static final Logger LOG = LoggerFactory.getLogger(LandRoverCar.class);

    @Override
    public void run() {
    gear.gear();
    LOG.info("LandRoverCar is running");
    };

    }

    抽象變速器

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    package com.jasongj.transmission;

    public abstract class Transmission{

    public abstract void gear();

    }

    手動檔

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    package com.jasongj.transmission;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class Manual extends Transmission {

    private static final Logger LOG = LoggerFactory.getLogger(Manual.class);

    @Override
    public void gear() {
    LOG.info("Manual transmission");
    }
    }

    自動檔

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    package com.jasongj.transmission;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    public class Auto extends Transmission {

    private static final Logger LOG = LoggerFactory.getLogger(Auto.class);

    @Override
    public void gear() {
    LOG.info("Auto transmission");
    }
    }

    有了變速器和品牌兩個維度各自的實現后,可以通過聚合,實現不同品牌不同變速器的車,如下

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    package com.jasongj.client;

    import com.jasongj.brand.AbstractCar;
    import com.jasongj.brand.BMWCar;
    import com.jasongj.brand.BenZCar;
    import com.jasongj.transmission.Auto;
    import com.jasongj.transmission.Manual;
    import com.jasongj.transmission.Transmission;

    public class BridgeClient {

    public static void main(String[] args) {
    Transmission auto = new Auto();
    AbstractCar bmw = new BMWCar();
    bmw.setTransmission(auto);
    bmw.run();


    Transmission manual = new Manual();
    AbstractCar benz = new BenZCar();
    benz.setTransmission(manual);
    benz.run();
    }

    }

    橋接模式與OOP原則

    已遵循的原則

    • 依賴倒置原則
    • 迪米特法則
    • 里氏替換原則
    • 接口隔離原則
    • 單一職責原則
    • 開閉原則

    未遵循的原則

    • NA

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