Build an object from an existing one using lombok

Question

Lets say I have a lombok annotated class like

@Builder
class Band {
   String name;
   String type;
}

I know I can do:

Band         


        

Answer 1

Is there an easy way to create an object of Foo using the existing object as a template and changing one of it's properties? (emphasis mine)

If you really want to change a single property, then there's a nicer and more efficient way:

@With
class Band {
   String name;
   String type;
}

Band nirvana = rollingStones.withName("Nirvana");

The wither creates no garbage, but it can change just a single field. For changing many fields, you could use

withA(a).withB(b).withC(c)....

and produce tons of garbage (all intermediate results) but than toBuilder is more efficient and more natural.

NOTE: Older versions of lombok have used @Wither annotation. See beginning of documentation.