This may sounds like a strange question, but is there a way to refer to a standard no-op (aka null operation, null-pattern method, no-operation, do-nothing method) method for a Lambda in Java 8.
Currently, I have a method that takes a, say, void foo(Consumer<Object>)
, and I want to give it a no-op, I have to declare:
foo(new Consumer<Object>() {
public void accept(Object o) {
// do nothing
}
}
where I would like to be able to do something like:
foo(Object::null)
instead. Does something like exist?
Not sure how that would work with multi-parameter methods -- perhaps this is a deficiency in the lambdas in Java.
This is no deficiency.
Lambdas in Java are instances of functional interfaces; which, in turn, are abstracted to instances of Java constructs which can be simplified to one single abstract method, or SAM.
But this SAM still needs to have a valid prototype. In your case, you want to have a no-op Consumer<T>
which does nothing whatever the T
.
It still needs to be a Consumer<T>
however; which means the minimal declaration you can come up with is:
private static final Consumer<Object> NOOP = whatever -> {};
and use NOOP
where you need to.