根據需要創建新線程的對象。使用線程工廠就無需再手工編寫對?new Thread?的調用了，從而允許應用程序使用特殊的線程子類、屬性等等。 JDK中的介紹：

An object that creates new threads on demand. Using thread factories removes hardwiring of calls tonew Thread, enabling applications to use special thread subclasses, priorities, etc.

The simplest implementation of this interface is just:

?

[java]?view plaincopy print?

class?SimpleThreadFactory?implements?ThreadFactory?{??

??public?Thread?newThread(Runnable?r)?{??

????return?new?Thread(r);??

??}??

}??

?

The?Executors.defaultThreadFactory?method provides a more useful simple implementation, that sets the created thread context to known values before returning it.? [java]?view plaincopy print?

/**?

?????*?The?default?thread?factory?

?????*/??

????static?class?DefaultThreadFactory?implements?ThreadFactory?{??

????????static?final?AtomicInteger?poolNumber?=?new?AtomicInteger(1);??

????????final?ThreadGroup?group;??

????????final?AtomicInteger?threadNumber?=?new?AtomicInteger(1);??

????????final?String?namePrefix;??

??

????????DefaultThreadFactory()?{??

????????????SecurityManager?s?=?System.getSecurityManager();??

????????????group?=?(s?!=?null)??s.getThreadGroup()?:??

?????????????????????????????????Thread.currentThread().getThreadGroup();??

????????????namePrefix?=?"pool-"?+??

??????????????????????????poolNumber.getAndIncrement()?+??

?????????????????????????"-thread-";??

????????}??

??

????????public?Thread?newThread(Runnable?r)?{??

????????????Thread?t?=?new?Thread(group,?r,??

??????????????????????????????????namePrefix?+?threadNumber.getAndIncrement(),??

??????????????????????????????????0);??

????????????if?(t.isDaemon())??

????????????????t.setDaemon(false);??

????????????if?(t.getPriority()?!=?Thread.NORM_PRIORITY)??

????????????????t.setPriority(Thread.NORM_PRIORITY);??

????????????return?t;??

????????}??

????}??

下面寫一簡單示例。 [java]?view plaincopy print?

package?com.test;??

??

import?java.util.concurrent.ExecutorService;??

import?java.util.concurrent.Executors;??

import?java.util.concurrent.ThreadFactory;??

??

class?Task?implements?Runnable{??

????int?taskId;??

????public?Task(int?taskId)?{??

????????this.taskId=taskId;??

????}??

??????

????@Override??

????public?void?run()?{??

????????System.out.println(Thread.currentThread().getName()+"--taskId:?"+taskId);??

??????????

????}??

}??

??

class?DaemonThreadFactory?implements?ThreadFactory?{??

????@Override??

????public?Thread?newThread(Runnable?r)?{??

????????Thread?t=new?Thread(r);??

????????t.setDaemon(true);??

????????return?t;??

????}??

??????

}??

public?class?ThreadFactoryTest?{??

????public?static?void?main(String[]?args)?{??

????????ExecutorService?exec=Executors.newFixedThreadPool(3,new?DaemonThreadFactory());??

????????for(int?i=0;i<3;i++)?{??

????????????exec.submit(new?Task(i));??

????????}??

????????exec.shutdown();??

????}??

}??

輸出如下： Thread-0--taskId: 0
Thread-1--taskId: 1
Thread-2--taskId: 2 分析： DaemonThreadFactory中覆寫的newThread()方法與submit()方法的調用關系，也就是說DaemonThreadFactory是如何起作用的。 調試輸出其調用關系： 也就是說，submit()時會調用DaemonThreadFactory類的newThread()方法來創建線程。

轉載于:https://www.cnblogs.com/yaowen/p/6069628.html

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