What Happens at Compile time and Runtime in Java?

At compile time, java file is compiled by Java Compiler

[It does not interact with OS] and converts the java code into byte code.

What is ByteCode:

Byte Code is the Intermediate Code Which is only understood by the JRE and It is stored in the .class file.

Ex: [Simple.class]

What happens at Runtime?

Classloader:

is the subsystem of JVM/JRE that is used to load class files.

Bytecode Verifier:

checks the code fragments for illegal code that can violate access right to objects.

Interpreter:

It read bytecode stream then execute the instructions.

Process of Compilation & Execution: