What is the role of synchronization when working with classes in a multithreaded environment?

Synchronization in a multithreaded environment is necessary to prevent multiple threads from accessing shared resources or data simultaneously, which can lead to race conditions and unpredictable program behavior.

In Java, synchronization is achieved using the synchronized keyword, which provides mutual exclusion (mutex) when executing a critical section of code. This guarantees that only one thread can execute a synchronized block or method at a time.

Example:

public class Counter {
    private int count = 0;

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

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

Without synchronization, multiple threads could modify count simultaneously, leading to incorrect results. Synchronization ensures data correctness and integrity during parallel access.