Does instanceof operator generate a lot of overhead ? Why? [duplicate]

Question

I have a colleague here in my project, who is deeply against the use of instanceof operator, because it "generates a lot of overhead", what is the reason for that? Is it true?

Is there another way to check the type of the Object instead of using it?

Because I find it very useful in some occasions.

Answer 1

It does generate some overhead, combined with the subsequent casting. With recent version of Java the overhead has decreased. But anyway that's microoptimization - i.e. you should not worry about it in the general case.

The real argument against instanceof is that in many cases there are better OOP ways to achieve the desired behaviour.