package com.tn.pattern;

 public class Client {

     public static void main(String[] args) {

         Director director=Director.getInstance();

         director.construct(new ConcreteBuilder1());

         director.construct(new ConcreteBuilder2());

     }

 }

 class Director{

     static Director director;

     private Director(){}

     public static Director getInstance(){

         if(director==null)

             director=new Director();

         return director;

     }

     public void construct(Builder builder){

         builder.buildPart1();

         builder.buildPart2();

     }

 }

 interface Builder{

     void buildPart1();

     void buildPart2();

     Product retrieveResult();

 }

 class ConcreteBuilder1 implements Builder{

     Product product;

     @Override

     public void buildPart1() {

         System.out.println("ConcreteBuilder1.buildPart1()");

         product=new Product1();

     }

     @Override

     public void buildPart2() {}

     @Override

     public Product retrieveResult() {

         return product;

     }

 }

 class ConcreteBuilder2 implements Builder{

     Product product;

     @Override

     public void buildPart1() {}

     @Override

     public void buildPart2() {

         System.out.println("ConcreteBuilder2.buildPart2()");

         product=new Product2();

     }

     @Override

     public Product retrieveResult() {

         return product;

     }

 }

 interface Product{}

 class Product1 implements Product{

     public Product1(){

         System.out.println("Product1.Product1()");

     }

 }

 class Product2 implements Product{

     public Product2(){

         System.out.println("Product2.Product2()");

     }

 }