How Does Java’s Memory Model Affect Multithreading?

How Does Java’s Memory Model Affect Multithreading?

The Java Memory Model defines how threads interact through memory, ensuring consistency.

Visibility and Reordering

Java’s memory model ensures that changes made by one thread are visible to others in a predictable way.

Synchronization and Volatile

The model defines how synchronization and the volatile keyword affect the visibility of variables across threads.

Example Code

            volatile boolean running = true;
            Thread t = new Thread(() -> {
                while (running) {
                    // Do some work
                }
            });
            t.start();
            running = false; // Ensures visibility due to volatile
            

This code shows how volatile ensures variable visibility across threads.