How do you use ThreadLocal with a simple code example?

ThreadLocal is a Java class that provides thread-local variables. Each thread accessing such a variable has its own, independently initialized copy of the variable. This is particularly useful in situations where you need to store data that is confined to a single thread, such as user sessions or database connections.

Here is a simple example of how to use ThreadLocal:


        import java.util.concurrent.ExecutorService;
        import java.util.concurrent.Executors;

        public class ThreadLocalExample {
            // Create a ThreadLocal variable
            private static ThreadLocal threadLocalValue = ThreadLocal.withInitial(() -> 1);

            public static void main(String[] args) {
                ExecutorService executorService = Executors.newFixedThreadPool(3);

                for (int i = 0; i < 3; i++) {
                    final int threadNum = i;
                    executorService.submit(() -> {
                        // Accessing the ThreadLocal value
                        System.out.println("Thread " + threadNum + " initial value: " + threadLocalValue.get());
                        
                        // Updating the ThreadLocal value
                        threadLocalValue.set(threadLocalValue.get() + threadNum);
                        System.out.println("Thread " + threadNum + " updated value: " + threadLocalValue.get());
                    });
                }
                
                executorService.shutdown();
            }
        }

How do you use ThreadLocal with a simple code example?

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How do you use ThreadLocal with a simple code example?

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