java设计模式:建造者模式之生产线

package com.secondgod.builder;
import java.text.MessageFormat;
/**
 * 汽车
 *
 * @author 二当家的白帽子 https://le-yi.blog.csdn.net/
 */
public class Car {
    /**
     * 车身（必须有）
     */
    private final String body;
    /**
     * 引擎
     */
    private       String engine;
    /**
     * 动力源
     */
    private       String energy;
    public Car(String body) {
        this.body = body;
    }
    public String getBody() {
        return body;
    }
    public String getEngine() {
        return engine;
    }
    public void setEngine(String engine) {
        this.engine = engine;
    }
    public String getEnergy() {
        return energy;
    }
    public void setEnergy(String energy) {
        this.energy = energy;
    }
    public String toString() {
        return MessageFormat.format("在[{0}]车身上配备有[{1}]引擎和[{2}]动力源的汽车", body, engine, energy);
    }
}

package com.secondgod.builder;
/**
 * 汽车生产线
 * 
 * @author 二当家的白帽子 https://le-yi.blog.csdn.net/
 */
public interface ICarBuilder {
    /**
     * 建造车身
     */
    void buildBody();
    /**
     * 建造引擎
     */
    void buildEngine();
    /**
     * 建造动力源
     */
    void buildEnergy();
    /**
     * 取车
     * @return
     */
    Car retrieveCar();
}

package com.secondgod.builder;
/**
 * 燃油车生产线
 *
 * @author 二当家的白帽子 https://le-yi.blog.csdn.net/
 */
public class GasolineCarBuilder implements ICarBuilder {
    private Car car;
    @Override
    public void buildBody() {
        car = new Car("燃油");
    }
    @Override
    public void buildEngine() {
        car.setEngine("燃油发动机");
    }
    @Override
    public void buildEnergy() {
        car.setEnergy("汽油油箱");
    }
    @Override
    public Car retrieveCar() {
        Car retrieveCar = car;
        car = null;
        return retrieveCar;
    }
}

package com.secondgod.builder;
/**
 * 电动车生产线
 *
 * @author 二当家的白帽子 https://le-yi.blog.csdn.net/
 */
public class ElectricCarBuilder implements ICarBuilder{
    private Car car;
    @Override
    public void buildBody() {
        car = new Car("电动");
    }
    @Override
    public void buildEngine() {
        car.setEngine("电驱动系统");
    }
    @Override
    public void buildEnergy() {
        car.setEnergy("新能源电池");
    }
    @Override
    public Car retrieveCar() {
        Car retrieveCar = car;
        car = null;
        return retrieveCar;
    }
}

package com.secondgod.builder;
/**
 * 汽车工程师
 *
 * @author 二当家的白帽子 https://le-yi.blog.csdn.net/
 */
public class CarEngineer {
    /**
     * 构建汽车
     * 
     * @param builder
     * @return
     */
    public Car constructCar(ICarBuilder builder) {
        builder.buildBody();
        builder.buildEngine();
        builder.buildEnergy();
        return builder.retrieveCar();
    }
}

package com.secondgod.builder;
public class Test {
    public static void main(String[] args) {
        // 一个工程师
        CarEngineer carEngineer = new CarEngineer();
        // 两条生产线
        ICarBuilder gasolineCarBuilder = new GasolineCarBuilder();
        ICarBuilder electricCarBuilder = new ElectricCarBuilder();
        // 一天造两辆
        Car gasolineCar = carEngineer.constructCar(gasolineCarBuilder);
        Car electricCar = carEngineer.constructCar(electricCarBuilder);
        // 够生活了
        System.out.println(gasolineCar);
        System.out.println(electricCar);
    }
}