internal_program.md

What happens at compile time?

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At compile time, java file is compiled by Java Compiler (It does not interact with OS) and converts the java code into bytecode.

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What happens at runtime?

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At runtime, following steps are performed:

Classloader:

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

Bytecode Verifier:

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

Interpreter:

read bytecode stream then execute the instructions.