java设计模式创建模式Creational Pattern建造模式Builder Pattern

Posted 2020-09-20 xiongjiawei

 1 package com.tn.pattern;
 2 
 3 public class Client {
 4     public static void main(String[] args) {
 5         Director director=Director.getInstance();
 6         director.construct(new ConcreteBuilder1());        
 7         director.construct(new ConcreteBuilder2());
 8     }
 9 }
10 
11 class Director{
12     static Director director;
13     private Director(){}
14     public static Director getInstance(){
15         if(director==null)
16             director=new Director();
17         return director;
18     }
19     public void construct(Builder builder){
20         builder.buildPart1();
21         builder.buildPart2();
22     }
23 }
24 
25 interface Builder{
26     void buildPart1();
27     void buildPart2();
28     Product retrieveResult();
29 }
30 
31 class ConcreteBuilder1 implements Builder{
32     Product product;
33     @Override
34     public void buildPart1() {
35         System.out.println("ConcreteBuilder1.buildPart1()");
36         product=new Product1();
37     }
38     
39     @Override
40     public void buildPart2() {}
41     
42     @Override
43     public Product retrieveResult() {
44         return product;
45     }
46 }
47 
48 class ConcreteBuilder2 implements Builder{
49     Product product;
50     @Override
51     public void buildPart1() {}
52     
53     @Override
54     public void buildPart2() {
55         System.out.println("ConcreteBuilder2.buildPart2()");
56         product=new Product2();
57     }
58     
59     @Override
60     public Product retrieveResult() {
61         return product;
62     }
63 }
64 
65 interface Product{}
66 
67 class Product1 implements Product{
68     public Product1(){
69         System.out.println("Product1.Product1()");
70     }
71 }
72 
73 class Product2 implements Product{
74     public Product2(){
75         System.out.println("Product2.Product2()");
76     }
77 }