What tools or classes from standard libraries have you used for thread synchronization?

In Java, the following standard library tools are often used for thread synchronization:

• The keyword synchronized — blocks access to code or objects, providing exclusive access.

• Classes from the java.util.concurrent package:

  • ReentrantLock — a more flexible alternative to synchronized with the ability to attempt to acquire the lock and timeout.
  • CountDownLatch, CyclicBarrier — for coordinating multiple threads.
  • Semaphore — to limit the number of threads executing a certain section of code simultaneously.

Example of using synchronized:

public class Counter {
    private int count = 0;

    public synchronized void increment() {
        count++;
    }

    public synchronized int getCount() {
        return count;
    }
}