JVM (Java Virtual Machine) is the core component of the Java platform responsible for executing Java bytecode. It acts as a bridge between Java applications and the underlying operating system, enabling Java programs to run on different platforms without modification.
Key Points: • JVM executes the bytecode generated by the Java compiler. • It provides platform independence through the "Write Once, Run Anywhere" concept. • JVM manages memory allocation, garbage collection, and thread execution. • It converts bytecode into machine code using the Execution Engine and JIT Compiler. • JVM enhances application security through class loading and bytecode verification mechanisms.
Example: A Java application compiled on Windows can run on Linux or macOS without recompilation, provided a compatible JVM is installed on the target system.
Interview Tip: A concise interview answer is:
"JVM is the Java Virtual Machine responsible for executing Java bytecode. It is important because it provides platform independence, manages memory, performs garbage collection, and enables Java applications to run on any system that has a compatible JVM installed."