What is JIT compiler?

A JIT compiler is a just-in-time (JIT) compiler. It is a program that converts Java bytecode into native machine code that can directly be sent to the processor. This helps improve the performance of Java applications at runtime, as without the conversion, Java applications would run slower than native applications. The conversion makes the code easier to understand, hence faster to execute. It is called JIT as it compiles the code just-in-time to run. The JIT compiler is enabled by default, and is activated when a Java method is called.

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