package com.builder.theory;public class TestBuilder{    public static void main(String[] args)    {        Car car=Director.construct(new ConcreteBuilder());        System.out.println(car.getHead());        System.out.println(car.getBody());        System.out.println(car.getFoot());    }}package com.builder.theory;public class Car{    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;    }        }package com.builder.theory;public class Director{    public static Car construct(Builder builder)    {        builder.buildHead();        builder.buildBody();        builder.buildFoot();        return builder.buildPart();    }}package com.builder.theory;public interface Builder{    public void buildHead();    public void buildBody();    public void buildFoot();    public Car buildPart();}package com.builder.theory;public class ConcreteBuilder implements Builder{    Car car=null;        public ConcreteBuilder()    {        car=new Car();    }        @Override    public void buildHead()    {        car.setHead("汽车头部建造完成");            }    @Override    public void buildBody()    {        car.setBody("汽车身体建造完成");    }    @Override    public void buildFoot()    {        car.setFoot("汽车尾部建造完成");    }    @Override    public Car buildPart()    {        return car;    }}