1.兩個原子操作組合到一塊不一定是能保證原子性

ConcurrentLinkedQueue?

AtomicInteger? 兩個類都為線程安全的類，但是組合起來并不能保證原子性:

public static ConcurrentLinkedQueue concurrentLinkedQueue = new ConcurrentLinkedQueue();public static AtomicInteger atomicInteger =new AtomicInteger();public boolean put (Object object){if("1000".equals(String.valueOf(atomicInteger))){System.out.println("隊列已滿");return false;}try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}concurrentLinkedQueue.add(object);atomicInteger.incrementAndGet();return true;}public Object get(){if("0".equals(String.valueOf(atomicInteger)))return null;Object poll = concurrentLinkedQueue.remove();atomicInteger.decrementAndGet();return poll;}public static void main(String[] args) {ThreadPoolExecutor threadPool = new ThreadPoolExecutor(2, 4, 3, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(3),new ThreadPoolExecutor.DiscardOldestPolicy());Centor centor = new Centor();for(int i=0;i<3;i++){threadPool.execute(new Runnable() {@Overridepublic void run() {int i=0;while (true){centor.put(i++);System.out.println(Thread.currentThread().getName()+"數量"+atomicInteger);}}});} .... pool-1-thread-2數量967 pool-1-thread-1數量967 pool-1-thread-2數量969 pool-1-thread-1數量969 pool-1-thread-2數量971 pool-1-thread-1數量971 pool-1-thread-2數量973 pool-1-thread-1數量973 pool-1-thread-2數量975 pool-1-thread-1數量975 pool-1-thread-1數量977 pool-1-thread-2數量977 pool-1-thread-1數量978 pool-1-thread-2數量979 pool-1-thread-1數量980 pool-1-thread-2數量981 pool-1-thread-1數量983 pool-1-thread-2數量983 pool-1-thread-1數量985 pool-1-thread-2數量985 pool-1-thread-1數量986 pool-1-thread-2數量987 pool-1-thread-2數量989 pool-1-thread-1數量989 pool-1-thread-1數量991 pool-1-thread-2數量991 pool-1-thread-1數量992 pool-1-thread-2數量993 pool-1-thread-2數量994 pool-1-thread-1數量995 pool-1-thread-1數量997 pool-1-thread-2數量997 pool-1-thread-2數量999 pool-1-thread-1數量999 pool-1-thread-2數量1001 pool-1-thread-1數量1001 pool-1-thread-2數量1003 pool-1-thread-1數量1003 pool-1-thread-1數量1004 pool-1-thread-2數量1005 ....

總結

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