Would Java inline method(s) during optimization?

Question

I wonder if JVM/javac is smart enough to turn

// This line...
string a = foo();

string foo()
{
  return bar();
}

string bar()
{
  return some-complicated-s         


        

Answer 1

A "highly optimizing" JIT compiler will inline both cases (and, @Mysticial, it might even inline some polymorphic cases, by employing various forms of trickery).

You can increase the chances of inlining by making methods final, and a few other tricks.

javac does some primitive inlining, mostly of final/private methods, primarily intended to help out some conditional compilation paradigms.