1，Builder

为创建一个产品对象的各个部件指定抽象接口

public interface PersonBuilder {
    void buildHead();
    void buildBody();
    void buildFoot();
    Person buildPerson();
}

2，ConcreteBuilder

实现Builder的接口以构造和装配该产品的各个部件，定义并明确它所创建的表示，并提供一个检索产品的接口

class ManBuilder implements PersonBuilder {
    Person person;
    public ManBuilder() {
        person = new Man();
    }

    public void buildHead() {
        person.setHead("建造男人的头");
    }

    public void buildBody() {
        person.setBody("建造男人的身体");
    }

    public void buildFoot() {
        person.setFoot("建造男人的脚");
    }

    public Person buildPerson() {
        return person;
    }
}

class WomanBuilder implements PersonBuilder {
    Person person;
    public WomanBuilder() {
        person = new Woman();
    }
    public void buildBody() {
        person.setBody("建造女人的身体");
    }
    public void buildFoot() {
        person.setFoot("建造女人的脚");
    }
    public void buildHead() {
        person.setHead("建造女人的头");
    }
    public Person buildPerson() {
        return person;
    }
}

3，Director

构造一个使用Builder接口的对象，指导构建过程

public class PersonDirector {
    public Person constructPerson(PersonBuilder pb) {
        pb.buildHead();
        pb.buildBody();
        pb.buildFoot();
        return pb.buildPerson();
    }
}

4，Product

表示被构造的复杂对象。ConcreteBuilder创建该产品的内部表示并定义它的装配过程，包含定义组成部件的类，包括将这些部件装配成最终产品的接口

public class Person {
    private String head;
    private String body;
    private String foot;

    public String getHead() {
        return head;
    }
    public void setHead(String head) {
        this.head = head;
    }
    public String getBody() {
        return body;
    }
    public void setBody(String body) {
        this.body = body;
    }
    public String getFoot() {
        return foot;
    }
    public void setFoot(String foot) {
        this.foot = foot;
    }
}

class Man extends Person {
    public Man(){
        System.out.println("开始建造男人");
    }
}
class Woman extends Person {
    public Woman(){
        System.out.println("开始建造女人");
    }
}

5，Test验证代码

public class Test{
    public static void main(String[] args) {
        PersonDirector pd = new PersonDirector();
        Person womanPerson = pd.constructPerson(new ManBuilder());
        Person manPerson = pd.constructPerson(new WomanBuilder());
    }
}

6，参考链接

https://blog.csdn.net/jason0539/article/details/44992733