Question

My question is pretty simple:
Does the compiler treat all the methods in a final class as being final themselves? Does adding the final keyword to methods in a final class has any effect?

I understood that final methods have a better chance of getting inlined and this is why I am asking.

Thanks in advance.

Answer 1

You’re correct, all methods in a final class are implicitly final.

See here:

“Note that you can also declare an entire class final. A class that is
declared final cannot be subclassed. This is particularly useful, for
example, when creating an immutable class like the String class.”

And here:

All methods in a final class are implicitly final.

This may also be of interest for you: Performance tips for the Java final keyword