@Builder

@Builder

User.builder().name(UUID.randomUUID().toString()).build()

不使用 lombok 的方案

public class Example<T> {
private T foo;
private final String bar;

private Example(T foo, String bar) {
this.foo = foo;
this.bar = bar;
}

public static <T> ExampleBuilder<T> builder() {
return new ExampleBuilder<T>();
}

public static class ExampleBuilder<T> {
private T foo;
private String bar;

private ExampleBuilder() {}

public ExampleBuilder foo(T foo) {
this.foo = foo;
return this;
}

public ExampleBuilder bar(String bar) {
this.bar = bar;
return this;
}

@java.lang.Override
public String toString() {
return "ExampleBuilder(foo = " + foo + ", bar = " + bar + ")";
}

public Example build() {
return new Example(foo, bar);
}
}
}

使用 lombok 的方案 guava 16.0.1

@Builder

public class Example

{

private int foo;

private final String bar;

}

构造一个实例,属性不需要单独set 
Example.builder().foo(1).bar(“test”).build()

@Builder
@Getter
public class HttpProxyContext

@Bean
public HttpProxyContext httpActivityProxyContext() {
    return HttpProxyContext.builder()
            .baseUrl(environment.getProperty("activity.template.host"))
            .cdlTemplateDetailUrl("v1/cdl/template/detail")
            .userQuestionAireDetailUrl("v1/right/getUserQuestionnaireSurveyByProfileNo")
            .mktAppElasticLayerUrl("v1/layer/getMktAppElasticLayer")
            .appLayerUrl("v1/layer/getAppLayerConfig")
            .monitorUrl("v1/layer/saveMonitor")
            .objectMapper(objectMapper())
            .build();
}

@Builder(toBuilder = true)
@Getter
public class UserInfo {
  private String name;
  private String email;
  @MinMoney(message = "金额不能小于0.")
  @MaxMoney(value = 10, message = "金额不能大于10.")
  private Money price;

}

@Builder注解赋值新对象

UserInfo userInfo = UserInfo.builder()
        .name("zzl")
        .email("bgood@sina.com")
        .build();

@Builder注解修改原对象的属性值

修改实体，要求实体上添加@Builder(toBuilder=true)

 userInfo = userInfo.toBuilder()
        .name("OK")
        .email("zgood@sina.com")
        .build();

https://blog.csdn.net/mccand1234/article/details/53456411