Java8consumer风格Builder-创新互联

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 1 public static class GenericBuilder {
 2 private final Supplier instantiate;
 3 
 4 private final List> consumers = new ArrayList<>();
 5 
 6 public GenericBuilder(Supplier instantiate) {
 7  this.instantiate = instantiate;
 8         }
 9 
10 public static  GenericBuilder of(Supplier instantiator)  {
11  return new GenericBuilder<>(instantiator);
12         }
13 
14 public  GenericBuilder with(BiConsumer biConsumer, U value) {
15             Consumer setOperationFunction = instance -> biConsumer.accept(instance, value);
16             consumers.add(setOperationFunction);
17  return this;
18         }
19 
20 public T build() {
21             T instance = instantiate.get();
22 
23  // loop call each set function with object instance!24             consumers.forEach(consumer -> consumer.accept(instance));
25             consumers.clear();
26 
27  return instance;
28         }
29     }

使用：

 1 public class Dummy {
 2 private String name;
 3 private Integer age;
 4 private Boolean foreigner;
 5 
 6 public String getName() {
 7  return name;
 8         }
 9 
10 public void setName(String name) {
11  this.name = name;
12         }
13 
14 public Integer getAge() {
15  return age;
16         }
17 
18 public void setAge(Integer age) {
19  this.age = age;
20         }
21 
22 public Boolean getForeigner() {
23  return foreigner;
24         }
25 
26 public void setForeigner(Boolean foreigner) {
27  this.foreigner = foreigner;
28         }
29 
30 
31     }

Dummy build = GenericBuilder.of(Dummy::new).with(Dummy::setAge, 12)
                .with(Dummy::setName,"Vodoo")
                .with(Dummy::setForeigner,false).build();

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Java8consumer风格Builder-创新互联

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