What is a JIT Compiler in Java?

A JIT (Just-In-Time) Compiler is a part of the Java Virtual Machine (JVM) that makes Java programs run faster.

When you run a Java program, it is first converted into bytecode, which the JVM can understand. The JVM usually reads and executes this bytecode step by step (called interpretation), but this is slower😭😭.

The JIT Compiler helps by translating the bytecode into machine code (which the computer’s processor understands directly) while the program is running. It only does this for parts of the code that are used frequently. This way, the program runs much faster because the computer can execute the machine code😁😁 directly instead of interpreting bytecode repeatedly.