Java thread synchronization and mutual exclusion: theory and practice coexist to create a high-concurrency system

JavaThreadsOverview of synchronization and mutual exclusion:

php editor Xinyi will take you to an in-depth discussion of Java thread synchronization and mutual exclusion, combining theory with practice to help you build a high-concurrency system. Through this article, you will understand the concept, implementation methods and application skills of thread synchronization in actual projects, helping you to better handle multi-thread concurrency in Java development and improve system performance and stability.

Java thread synchronization and mutual exclusion mechanism:

Java provides a variety of synchronization mechanisms to help developers achieve thread security, including lock mechanisms, synchronization methods and volatile keywords. Among them, the lock mechanism is the most commonly used, and it can be implemented through the synchronized keyword or the Lock interface. A synchronized method refers to a method that adds the synchronized keyword before the method. This method can only be accessed by one thread at the same time. The volatile keyword ensures that variables are visible across multiple threads and prohibits instruction reordering.

Java thread synchronization and mutual exclusion practice:

In order to better understand Java thread synchronization and mutual exclusion, we use a simple example to demonstrate how to use the Java lock mechanism to achieve thread safety.

Sample code:

public class Counter {

private int count;

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

public int getCount() {
return this.count;
}
}

public class Main {

public static void main(String[] args) {
Counter counter = new Counter();

Thread thread1 = new Thread(() -> {
for (int i = 0; i < 10000; i++) {
counter.increment();
}
});

Thread thread2 = new Thread(() -> {
for (int i = 0; i < 10000; i++) {
counter.increment();
}
});

thread1.start();
thread2.start();

try {
thread1.join();
thread2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}

System.out.println("Final count: " + counter.getCount());// 输出Final count: 20000
}
}

In the above example, we defined a Counter class, which contains an integer member variable count and two methods: increment() and getCount(). The increment() method uses the synchronized keyword to mark it as a synchronized method, ensuring that it can only be accessed by one thread at a time. We created two threads, each thread will call the increment() method 10,000 times to increment the count variable. Due to the use of the synchronized keyword, the count variable can be guaranteed to be consistent across multiple threads, and the final output result is 20000.

Conclusion:

Java thread synchronization and mutual exclusion are essential knowledge for building a high concurrency system. Through the introduction and example demonstration of this article, I hope readers can have a deeper understanding of Java thread synchronization and mutual exclusion and can be applied in actual development. While mastering the basic knowledge, you also need to practice and Performance Optimization in combination with specific application scenarios to ensure the stability and performance of the system.

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