标签：size list cut 任务 nano OLE pre info executor
例子1：延迟3秒后，只执行1次
ScheduledExecutorService es = Executors.newScheduledThreadPool(5); log.info("开始时间"); try { for (int i = 0; i < 20; i++) { Runnable syncRunnable = new Runnable() { @Override public void run() { log.info(Thread.currentThread().getName()); } }; es.schedule(syncRunnable, 3000, TimeUnit.MILLISECONDS); } } finally { es.shutdown(); }
运行结果：
10:41:39.589 开始时间
10:41:42.595 pool-1-thread-1
10:41:42.595 pool-1-thread-2
10:41:42.595 pool-1-thread-3
10:41:42.595 pool-1-thread-4
10:41:42.596 pool-1-thread-2
10:41:42.596 pool-1-thread-5
10:41:42.596 pool-1-thread-1
10:41:42.596 pool-1-thread-3
10:41:42.597 pool-1-thread-4
10:41:42.597 pool-1-thread-2
10:41:42.597 pool-1-thread-5
10:41:42.597 pool-1-thread-1
10:41:42.598 pool-1-thread-3
10:41:42.598 pool-1-thread-4
10:41:42.598 pool-1-thread-2
10:41:42.599 pool-1-thread-5
10:41:42.599 pool-1-thread-1
10:41:42.600 pool-1-thread-3
10:41:42.600 pool-1-thread-4
10:41:42.600 pool-1-thread-2
调用的ThreadPoolExecutor：
public ScheduledThreadPoolExecutor(int corePoolSize) { super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS, new DelayedWorkQueue()); }
corePoolSize=5，maximumPoolSize=Integer.MAX_VALUE
keepAliveTime=0纳秒
allowCoreThreadTimeout=false（默认）
采用延迟队列DelayedWorkQueue
因此，
因此，类似newFixedThreadPool
public ScheduledThreadPoolExecutor(int corePoolSize) { super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS, new DelayedWorkQueue()); }
线程池（4）Executors.newScheduledThreadPool-只执行1次
标签：size list cut 任务 nano OLE pre info executor
原文地址：https://www.cnblogs.com/yaoyuan2/p/9606546.html
