I wouldn't compare them in terms of pros/cons since they have different purposes and there's seldom a "choice" to make between the two.
a.getClass()returns the runtime type of
a. I.e., if you have
A a = new B();then
a.getClass()will return the
A.classevaluates to the
Aclass statically , and is used for other purposes often related to reflection.
In terms of performance, there may be a measurable difference, but I won't say anything about it because in the end it is JVM and/or compiler dependent.
This post has been rewritten as an article here.