You can use the toBuilder
parameter to give your instances a toBuilder()
method.
@Builder(toBuilder=true)
class Foo {
int x;
...
}
Foo f0 = Foo.builder().build();
Foo f1 = f0.toBuilder().x(42).build();
From the documentation:
If using @Builder to generate builders to produce instances of your own class (this is always the case unless adding @Builder to a method that doesn’t return your own type), you can use @Builder(toBuilder = true) to also generate an instance method in your class called toBuilder(); it creates a new builder that starts out with all the values of this instance.
Disclaimer: I am a lombok developer.