

Hi,
Here is the answer of your question.
JIT means Just In Time compiler.The JIT used to compile java source file and generate class files.The execution engine means Java Virtual Machine(JVM) which executes the class files A software "execution engine" that safely and compatibly executes the byte codes in Java class files on a Processor.
A module that alternately decodes and executes every statement in some body of code. The Java interpreter decodes and executes bytecode for the Java virtual machine The Java interpreter is actually a part of JVM. Virtual machine is not just executing the bytecodes, it has lot of tasks to do. That full-fledged environment is referred to as JVM.
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