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class SimpleThreadFactory implements ThreadFactory {  
  public Thread newThread(Runnable r) {  
    return new Thread(r);  
  }  
}

Executors.defaultThreadFactory提供了一个更有用且简单的实现。

/** 
     * 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;  
        }  
    }

下面写一简单示例。

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();  
    }  
}  

submit()会调用DaemonThreadFactory类的newThread()方法来创建线程。

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