Java Lombok @Builder 继承解决方法
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Lombok @Builder inheritance workaround
提问by Vivek Goel
Lombok @Builder doesn't work for inheritance use cases:
Lombok @Builder 不适用于继承用例：
For example
例如
class Foo{
protected int xyz1;
.....
protected String xyz7;
}
class Bar extends Foo{
}
For given use case Lombok will not be able to generate methods to set value of parameter defined in Foo class.
对于给定的用例，Lombok 将无法生成方法来设置 Foo 类中定义的参数值。
A workaround for this is:
对此的解决方法是：
- Manual creating constructor of Bar.
- Putting a Builder annotation on that constructor.
- 手动创建 Bar 的构造函数。
- 在该构造函数上放置 Builder 注释。
Is there a better workaround ?
有更好的解决方法吗？
回答by fd8s0
I leave this here for reference, as other answers demonstrate there is now (not at the time this answer was posted) a @SuperBuilder feature available now in the library which seems more fitting.
我将其留在这里以供参考，因为其他答案表明现在（不是在发布此答案时）库中现在提供了一个 @SuperBuilder 功能，这似乎更合适。
It′s a bit hidden, but people have had this question before, see:
这有点隐蔽，但人们以前有过这个问题，请参阅：
https://reinhard.codes/2015/09/16/lomboks-builder-annotation-and-inheritance/
https://reinhard.codes/2015/09/16/lomboks-builder-annotation-and-inheritance/
To summarise the blog post
总结博客文章
@AllArgsConstructor
public class Parent {
private String a;
}
public class Child extends Parent {
private String b;
@Builder
private Child(String a, String b){
super(a);
this.b = b;
}
}
Would allow you to use
会让你使用
Child.builder().a("testA").b("testB").build()
回答by Jacques Koorts
There is a solution to this problem currently in the works. Check the progress here: https://github.com/rzwitserloot/lombok/pull/1337
目前正在解决这个问题。在此处查看进度：https: //github.com/rzwitserloot/lombok/pull/1337
回答by Amit Kaneria
Lombok has introduced experimental features with version: 1.18.2 for inheritance issues faced with Builder annotation, and can be resolved with @SuperBuilder annotation as below.
Lombok 已经在 version: 1.18.2 中引入了实验性功能，用于解决 Builder 注解面临的继承问题，可以使用 @SuperBuilder 注解解决，如下所示。
@SuperBuilder
public class ParentClass {
private final String a;
private final String b;
}
@SuperBuilder
public class ChildClass extends ParentClass{
private final String c;
}
Now, one can use Builder class as below (that was not possible with @Builder annotation)
现在，可以使用如下的 Builder 类（@Builder 注释无法实现）
ChildClass.builder().a("testA").b("testB").c("testC").build();
