A just-in-time (JIT) compiler converts Java source code into machine code, and a Java interpreter executes the machine code, called bytecode, because the operating system cannot execute it.

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A JIT compiler actually compiles bytecode (which is produced from Java source code by the Java compiler) into machine code at runtime, improving performance. The Java interpreter (part of the Java Virtual Machine) directly executes bytecode, not machine code.

A Just-In-Time (JIT) Compiler Converts Java Source Code into Machine