What is the role of the OS when JVM executes a Java application? And why do we need the OS?

Question

I have done some reading on the internet and some people say that Java application is executed by the java virtual machine (JVM). The word \"execute\" confuses me a little bit.

Answer 1

As we know OS does not Execute any program it provide Environment for processor to Execute if we talk about Environment it allocate Memory Loading file Giving instruction to the Processor,Manage the Address
of loaded data method work of the Processor is only Executing program this thing happen in c or any procedural programming Language if we see than OS Playing a very vital Role in this overhead on OS Because if we write a small simple program in c like Hello World which contains only one Main function when will compile it generate .exe file of more than one function which is taken from Library function so manage all thing by OS is tedious job so in JVM has given Relief to OS here the work of OS is only to load the JVM from hard disk to RAM and make the jvm Execute and allocate space for JVM to execute java Program here Momery allocation ,Loading on Byte code file from Hard disk,Address Management ,Memory Allocation and De-allocation is Done by JVM itself so OS is free it can do other work.jvm allocate or Deallocate memory based on What ever OS has given to Execute the java Program.

if we talk about Execution JVM Contains Interpreter as well as JIT compiler which converting the Byte code into Machine code of Required Function after Execution of the method Executable code of that method is destroyed thats why we can say java does have .EXE File