?private?ThreadPoolExecutor?threadpool; ?private?Runnable?runnable; ??public?HelloThread(){? ????threadpool=new?ThreadPoolExecutor(2,?10,?10,?TimeUnit.SECONDS,?new?ArrayBlockingQueue(10),? ????new?ThreadPoolExecutor.DiscardOldestPolicy());? ????threadpool.execute(new?Runnable(){? ??????public?void?run(){? ????????try?{? ??????????Thread.sleep(1000);? ????????}?catch?(InterruptedException?e)?{? ??????????e.printStackTrace();? ????????}? ???? ??????} ????});??? ??}? ?? ??//add?task?into?thread?pool? ??public?void?submit(final?int?flag){? ??runnable=new?Runnable(){? ??????public?void?run(){? ????????try?{? ??????????Thread.sleep(1000);? ????????}?catch?(InterruptedException?e)?{? ??????????e.printStackTrace();? ????????}? ????????System.out.println(flag?+?"???Hello");? ??????} ????}; ????threadpool.execute(runnable);????? ??}? ???? /** ?*?close?thread?pool ?*/ public?void?shutdown()?{ threadpool.remove(runnable); threadpool.shutdown(); } @Test public?void?testThread(){ HelloThread?t?=?new?HelloThread(); for?(int?i?=?0;?i?<?10;?i++)?{ System.out.println("time:"?+?i); t.submit(i); } t.shutdown(); } public?static?void?main(String[]?args)?{ HelloThread?t?=?new?HelloThread(); for?(int?i?=?0;?i?<?10;?i++)?{ System.out.println("time:"?+?i); t.submit(i); } t.shutdown(); } 唯一不同是用main測試和testThread測試，輸出的結果不同。?System.out.println(flag?+?"???Hello"); ?只有用main測試，才能輸出