What is JIT (Just-In-Time) compilation?

JIT (Just-In-Time) compilation is a method of optimization where bytecode is executed by an interpreter, but its frequently used parts are compiled into machine code at runtime.

Advantages of JIT:

• Improved performance due to executing optimized machine code.
• Adaptation to the specific CPU architecture.

Disadvantages of JIT:

• Initial compilation time, which can cause startup delays.
• Additional memory consumption for storing compiled code.

In Android, JIT was used in older Dalvik versions and is now used in ART (Android Runtime) for performance optimization. ART combines AOT (Ahead-Of-Time) and JIT to achieve a better balance between startup time and runtime performance.