Welcome back, Sujit Kumar Mishra

What is a JIT compiler in Java? 

1: A JIT (Just-In-Time) compiler in Java is a part of the Java Virtual Machine (JVM) that helps make Java programs run faster. When you run a Java program, the JVM first converts the code into an intermediate form called bytecode. The JIT compiler then takes this bytecode and translates it into machine code (native code) just before it is needed, while the program is running. This makes the program execute more quickly because the machine code runs directly on your computer’s processor. In short, the JIT compiler improves the speed and performance of Java applications by converting bytecode to machine code at runtime.

2:  The JIT compiler is not strictly mandatory, but it is highly beneficial. Java programs can run without the JIT compiler, but they will be slower because the JVM would interpret the bytecode line by line instead of converting it to faster machine code. The JIT compiler is used to boost performance, so most Java environments include it by default.

In summary, while Java can work without JIT, having it makes programs run much faster and more efficiently.