java - 为什么 Lombok @Builder 与此构造函数不兼容？

Question

我有这个简单的代码:

@Data
@Builder
public class RegistrationInfo {

    private String mail;
    private String password;

    public RegistrationInfo(RegistrationInfo registrationInfo) {
        this.mail = registrationInfo.mail;
        this.password = registrationInfo.password;
    }
}

首先，我只使用 @Builder Lombok 注释，一切都很好。但我添加了构造函数，代码不再编译。错误是:

Error:(2, 1) java: constructor RegistrationInfo in class com.user.RegistrationInfo cannot be applied to given types;
  required: com.user.RegistrationInfo
  found: java.lang.String,java.lang.String
  reason: actual and formal argument lists differ in length  

所以我有两个问题:

1. 为什么 Lombok @Builder 与此构造函数不兼容？
2. 考虑到我同时需要构建器和构造函数，如何编译代码？

Answer 1

您可以添加 @AllArgsConstructor 注释，因为

@Builder generates an all-args constructor if there are no otherconstructors defined.

(引用@Andrew Tobilko)

或者将属性设置为@Builder:@Builder(toBuilder = true)这为您提供了复制构造函数的功能。

@Builder(toBuilder = true)
class Foo {
    // fields, etc
}

Foo foo = getReferenceToFooInstance();
Foo copy = foo.toBuilder().build();