建造者模式

/**
 * 产品角色
 */
@Getter
@Setter
@ToString
public class Product {

    /**
     * 零件1
     */
    private PartOne partOne;
    /**
     * 零件2
     */
    private PartTwo partTwo;
    /**
     * 零件3
     */
    private PartThree partThree;
}

/**
 * 零件1
 */
public class PartOne {
}

/**
 *零件2
 */
public class PartTwo {
}

/**
 * 零件3
 */
public class PartThree {
}
/**
 * 零件3
 */
public class PartThree {
}

/**
 * 抽象建造者角色
 */
public interface Builder {

    void buildOne();
    void buildTwo();
    void buildThree();
    Product result();
}

/**
 * 具体建造者角色
 */
public class ConcreteBuilder implements Builder {

    private Product product = new Product();

    @Override
    public void buildOne() {
        PartOne partOne = new PartOne();
        System.out.println("一系列创建partone的逻辑");
        product.setPartOne(partOne);
    }

    @Override
    public void buildTwo() {
        PartTwo partTwo = new PartTwo();
        System.out.println("一系列创建parttwo的逻辑");
        product.setPartTwo(partTwo);
    }

    @Override
    public void buildThree() {
        PartThree partThree = new PartThree();
        System.out.println("一系列创建partthree的逻辑");
        product.setPartThree(partThree);
    }

    @Override
    public Product result(){
        return product;
    }
}

/**
 * 导演者角色
 */
public class Director{

    private Builder builder;

    public Director(){
        builder = new ConcreteBuilder();
    }

    public void buildOne() {
        builder.buildOne();
    }

    public void buildTwo() {
        builder.buildTwo();
    }

    public void buildThree() {
        builder.buildThree();
    }

    public Product getProduct() {
        return builder.result();
    }
}

/**
 * 客户端
 */
public class Client {

    public static void main(String[] args) {
        Director director = new Director();
        director.buildOne();
        System.out.println(director.getProduct());
        director.buildTwo();
        System.out.println(director.getProduct());
        director.buildThree();
        System.out.println(director.getProduct());
    }
}