Java并发编程：volatile关键字解析

Java并发编程：volatile关键字解析
https://www.cnblogs.com/dolphin0520/p/3920373.html

采用synchronized：
采用Lock：
采用AtomicInteger：

https://www.ibm.com/developerworks/cn/java/j-jtp06197.html

清单 2. 将 volatile 变量作为状态标志使用
volatile boolean shutdownRequested;
...

public void shutdown() { shutdownRequested = true; }

public void doWork() {
    while (!shutdownRequested) {
        // do stuff
    }
}

清单 6. 结合使用 volatile 和 synchronized 实现 “开销较低的读－写锁”
@ThreadSafe
public class CheesyCounter {
    // Employs the cheap read-write lock trick
    // All mutative operations MUST be done with the 'this' lock held
    @GuardedBy("this") private volatile int value;

    public int getValue() { return value; }

    public synchronized int increment() {
        return value++;
    }
}