newCachedThreadPool创建一个可缓存线程池,如果线程池长度超过处理需要,可灵活回收空闲线程,若无可回收,则新建线程。
public static void main(String[] args) { ExecutorService cachedThreadPool = Executors.newCachedThreadPool(); for (int i = 0; i < 10; i++) { final int index = i; try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } cachedThreadPool.execute(new Runnable() { public void run() { System.out.println(index); } }); } }
public static void main(String[] args) { ExecutorService fixedThreadPool = Executors.newFixedThreadPool(3); for (int i = 0; i < 10; i++) { final int index = i; fixedThreadPool.execute(new Runnable() { public void run() { try { System.out.println(index); Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } }); } }
public static void main(String[] args) { ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5); for (int i = 0; i < 10; i++) { scheduledThreadPool.schedule(newRunnable() { public void run() { System.out.println("delay 3 seconds"); } }, 3, TimeUnit.SECONDS); } }
public static void main(String[] args) { ExecutorService singleThreadExecutor = Executors.newSingleThreadExecutor(); for (int i = 0; i < 10; i++) { final int index = i; singleThreadExecutor.execute(new Runnable() { public void run() { /* System.out.println(index);*/ try { System.out.println(index); Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } } }); } }
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