设计模式之建造者模式 Builder

• 本质与使用场景

public interface AirShipBuilder {

    Engine builderEngine();
    OrbitalModule builderOrbitalModule();
    EscapeTower  builderEscapeTower();

}

public class SxtAirShipBuilder implements AirShipBuilder{  //StringBuilder,以后学习XML解析中，JDOM库中的类：DomBuilder,SaxBuilder

    @Override
    public Engine builderEngine() {
        System.out.println("构建尚学堂牌发动机");
        return new Engine("尚学堂牌发动机");
    }

    @Override
    public OrbitalModule builderOrbitalModule() {
        System.out.println("构建尚学堂牌轨道舱");
        return new OrbitalModule("尚学堂牌轨道舱");
    }

    @Override
    public EscapeTower builderEscapeTower() {
        System.out.println("构建尚学堂牌逃逸塔");
        return new EscapeTower("尚学堂牌逃逸塔");
    } 

}

public interface AirShipDirector {
    
    AirShip directAirShip();
}

public class SxtAirShipDirector implements AirShipDirector{

    private AirShipBuilder builder;
        
    public SxtAirShipDirector(AirShipBuilder builder) {
        super();
        this.builder = builder;
    }


    @Override
    public AirShip directAirShip() {
        
        Engine e = builder.builderEngine();
        OrbitalModule o  = builder.builderOrbitalModule();
        EscapeTower et = builder.builderEscapeTower();
        
        //装配
        AirShip ship = new AirShip();
        ship.setEngine(e);
        ship.setEscapeTower(et);
        ship.setOrbitalModule(o);
        
        return ship;
    }

}

public class AirShip {
    
    private OrbitalModule orbitalModule;  //轨道舱
    private Engine engine;                //发动机
    private EscapeTower escapeTower;      //逃逸塔
    
    public void launch(){
        System.out.println("发射！！");
    }
    
    public OrbitalModule getOrbitalModule() {
        return orbitalModule;
    }
    public void setOrbitalModule(OrbitalModule orbitalModule) {
        this.orbitalModule = orbitalModule;
    }
    public Engine getEngine() {
        return engine;
    }
    public void setEngine(Engine engine) {
        this.engine = engine;
    }
    public EscapeTower getEscapeTower() {
        return escapeTower;
    }
    public void setEscapeTower(EscapeTower escapeTower) {
        this.escapeTower = escapeTower;
    }
}

class OrbitalModule{
    private String name;

    public OrbitalModule(String name) {
        super();
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

class Engine{
    private String name;

    public Engine(String name) {
        super();
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

class EscapeTower{
    private String name;

    public EscapeTower(String name) {
        super();
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

public class Client {
    
    public static void main(String[] args) {
        AirShipDirector director = new SxtAirShipDirector(new SxtAirShipBuilder());
        AirShip ship = director.directAirShip();
        System.out.println(ship.getEngine().getName());
        
        ship.launch();
    }
}