How Java Code Transforms from Source File to JVM Execution

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When a Java program is run, it passes through multiple stages before any output is produced. The Java compiler (javac) first converts human-readable source code into platform-neutral bytecode stored in a .class file, rather than compiling directly to machine code. This bytecode is then picked up by the Java Virtual Machine (JVM), which loads it through a class loader, verifies its safety, and manages runtime memory. The JVM's interpreter and JIT compiler handle actual execution, translating bytecode into native instructions for the host platform. This architecture is the basis of Java's 'Write Once, Run Anywhere' principle, allowing the same .class file to run on Windows, Linux, macOS, or any system with a compatible JVM.

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ProgrammingDEV Community ·

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