Java ThreadLocal: Purpose & Usage Guide

The ThreadLocal class is a tool class in Java for creating thread-local variables, where each thread has its own independent copy of the variable so that they can manipulate it independently without affecting other thread’s copies. Its main purposes include:

1. Provide each thread with its own copy of variables to ensure data isolation between threads.
2. Objects can be shared between different threads without the need for thread synchronization.
3. In a multi-threading environment, thread safety issues are prevented.

With the ThreadLocal class, it is easy to manage thread-specific data in multi-threaded programming, improving program performance and simplifying code logic.