[JAVA] Until the code is executed

Just-in-time compiler (JIT)

Code-> Intermediate code (byte code, etc.)-> Execute while compiling

merit --Can be executed independently of the environment --Intermediate code to machine language conversion is much more efficient and faster than source code conversion --Can be optimized using run-time statistics
Demerit --It is an overhead because it compiles at runtime.

Ahead-of-time compiler (AOV)

Code → Machine language → Execution

merit --Can perform time-consuming optimizations
Demerit --Execution environment is limited

Interpreter

Interpret and execute code → line by line

merit --Memory saving because it is executed in small units --Fast startup
Demerit --Slow on average

Adaptive compilation

At the beginning, it is executed as an interpreter, and frequently called methods and repeatedly executed code are compiled and executed. Good points of JIT and interpreter. wiki

I want to read it together

Java Performance

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