What are thread-local variables in Java?

What are thread-local variables in Java?

Thread-local variables in Java are variables that are accessible only by the thread that created them. They provide a way to maintain per-thread context.

How do I create a thread-local variable?

You can create a thread-local variable using the ThreadLocal class. For example: ThreadLocal<Integer> threadLocalVar = new ThreadLocal<>();.

What are some use cases for thread-local variables?

Common use cases include maintaining user sessions, database connections, and any data that should not be shared between threads.

Are there any drawbacks to using thread-local variables?

Yes, if not managed properly, they can lead to memory leaks since they hold references to objects that may not be cleared.