JAVA设计模式之建造者模式

Posted 2020-07-30 hxy

建造者模式：一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。

简单例子：

 1 public class Product 
 2 {
 3     private String partA;
 4     private String partB;
 5     
 6     public void setPartA(String partA) 
 7     {
 8         this.partA = partA;
 9     }
10 
11     public void setPartB(String partB)
12     {
13         this.partB = partB;
14     }
15     
16     @Override
17     public String toString()
18     {
19         return "[partA = " + partA + ", partB = " + partB + "]";
20     }
21 }
22 
23 public interface Factory 
24 {
25     public void init();
26     public void buildPartA();
27     public void buildPartB();
28     public Product getProduct();
29 }
30 
31 public class Factory1A2B implements Factory
32 {
33     private Product product;
34     
35     @Override
36     public void init() 
37     {
38         product = new Product();
39     }
40     
41     @Override
42     public void buildPartA() 
43     {
44         product.setPartA("1");
45     }
46 
47     @Override
48     public void buildPartB() 
49     {
50         product.setPartB("2");
51     }
52 
53     @Override
54     public Product getProduct() 
55     {
56         return product;
57     }
58 }
59 
60 public class Director
61 {
62     private Factory factory = new Factory1A2B();
63     
64     public Product newProduct()
65     {
66         factory.init();
67         factory.buildPartA();
68         factory.buildPartB();
69         return factory.getProduct();
70     }
71 }
72 
73 public class Test 
74 {
75     public static void main(String[] args)
76     {
77         Director director = new Director();
78         System.out.println(director.newProduct());
79     }
80 }