What methods and techniques are used to prevent race conditions in multithreaded applications?

The following methods and techniques are used to prevent race conditions in multithreaded applications on Android:

• Synchronization (synchronized): Using the synchronized keyword to lock critical sections of code so that only one thread can execute them at a time.

• Using classes from java.util.concurrent: For example, ReentrantLock, Semaphore, CountDownLatch for more flexible resource management.

• Immutable objects: Creating immutable objects that are safe for access from different threads without synchronization.

• Volatile variables: Ensuring visibility of variable changes between threads, preventing caching.

• Using thread-safe collections: For example, ConcurrentHashMap, CopyOnWriteArrayList.

• Architectural approaches: Using message queues, Handler, Looper for sequential task processing in a single thread.

Example of using synchronized:

public class Counter {
    private int count = 0;

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

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

Here, the increment and getCount methods are protected from concurrent access, preventing race conditions.