为什么Lombok @Builder与该构造函数不兼容? [英] Why is Lombok @Builder not compatible with this constructor?

问题描述

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，我只使用了@Builder Lombok批注，一切都很好.但是我添加了构造函数，并且代码不再编译.错误是:

First I was using only the @Builder Lombok annotation and everything was fine. But I added the constructor and the code does not compile any more. The error is:

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与该构造函数不兼容?
2. 考虑到我既需要构建器又需要构造器，如何使代码编译?

1. Why is Lombok @Builder not compatible with this constructor?
2. How do I make the code compile taking into account that I need both the builder and the constructor?

推荐答案

您可以添加@AllArgsConstructor批注，因为

@Builder如果没有其他参数，则会生成一个全参数的构造函数 构造函数已定义.

@Builder generates an all-args constructor iff there are no other constructors defined.

(引用@Andrew Tobilko)

(Quotting @Andrew Tobilko)

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

Or set an attribute to @Builder : @Builder(toBuilder = true) This gives you the functionality of a copy constructor.

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

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

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