Why is Java faster when using a JIT vs. compiling to machine code?

Question

I have heard that Java must use a JIT to be fast. This makes perfect sense when comparing to interpretation, but why can\'t someone make an ahead-of-time compiler that gener

Answer 1

Java's ability to inline across virtual method boundaries and perform efficient interface dispatch requires runtime analysis before compiling - in other words it requires a JIT. Since all methods are virtual and interfaces are used "everywhere", it makes a big difference.