Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Java code is compiled to bytecode which it is portable across many platforms.
But Java also is JIT compiled which happens on the fly.
Does this mean Java is compile twice? first by us to produce the bytecode and the second by the JVM?
Thanks.
Your code may be compiled from bytecode into native code by the JVM if it’s “hot enough”; and it may be so compiled several times, with the old version being discarded, depending on the runtime characteristics of your program.
The JIT is a complicated beast; in fact the Sun JVM has two JITs (-client and -server) that behave differently from each other, and some implementations even support both JITs running together (so you may have interpreted bytecode running alongside code compiled by two different JITs in your application).
I recommend you read more about Hotspot (the most common JIT since it’s the Sun one) if you’re really interested in this subject. You can start at Sun’s page.