AtomicReference示例

• 对引用型变量的原子性更新；

import com.example.concurrency.annotations.ThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.atomic.AtomicReference;

@Slf4j
@ThreadSafe
public class AtomicExample4 {

    private static AtomicReference<Integer> count = new AtomicReference<>(0);

    public static void main(String[] args) {
        count.compareAndSet(0, 2); // 2
        count.compareAndSet(0, 1); // no
        count.compareAndSet(1, 3); // no
        count.compareAndSet(2, 4); // 4
        count.compareAndSet(3, 5); // no
        log.info("count:{}", count.get());
    }

}

输出：

13:18:03.487 [main] INFO com.example.concurrency.example.atomic.AtomicExample4 - count:4