What does a JIT compiler do?

Question

I was just watching the Google IO videos and they talked about the JIT compiler that they included in the android. They showed a demo of performance improvements thanks to t

Answer 1

Doubt Sir if javac is a Java compiler its role is to convert source code to byte code means .Class and then .class (byte code) is interpreted by Java interpretor (Java) means by JVM and JIT is the part of JVM then what is its actual work