In Java what pros/cons exist surrounding the choice to use
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.class evaluates to the
A class 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.