ThreadFactory类的使用

　　之前创建线程的话，基本上是使用new Thread()，或者是将任务提交到线程池执行。今天看了一下洁城浩的《图解java多线程设计模式》突然看到还可以使用ThreadFactory来创建一个线程，感觉挺新奇的，就写了一个Example类来跑一下 。

 

 1 public class ThreadFactoryExample {
 2     public static void main(String[] args) {
 3         ThreadFactory factory = Executors.defaultThreadFactory();
 4         factory.newThread(new Task()).start();
 5         for (int i = 0; i < 10; i++) {
 6             System.out.println("Hello");
 7         }
 8     }
 9 }
10 
11 class Task implements Runnable {
12 
13     @Override
14     public void run() {
15         for (int i = 0; i < 10; i++) {
16             System.out.println("Task");
17         }
18     }
19 }

 

　　挺简单的使用方式。看了一下，Executors工具类返回的是DefaultThreadFactory类的实例，这个类的是一个Executors的内部类，代码很少，如下

 1 static class DefaultThreadFactory implements ThreadFactory {
 2         private static final AtomicInteger poolNumber = new AtomicInteger(1);
 3         private final ThreadGroup group;
 4         private final AtomicInteger threadNumber = new AtomicInteger(1);
 5         private final String namePrefix;
 6 
 7         DefaultThreadFactory() {
 8             SecurityManager s = System.getSecurityManager();
 9             group = (s != null) ? s.getThreadGroup() :
10                                   Thread.currentThread().getThreadGroup();
11             namePrefix = "pool-" +
12                           poolNumber.getAndIncrement() +
13                          "-thread-";
14         }
15 
16         public Thread newThread(Runnable r) {
17             Thread t = new Thread(group, r,
18                                   namePrefix + threadNumber.getAndIncrement(),
19                                   0);
20             if (t.isDaemon())
21                 t.setDaemon(false);
22             if (t.getPriority() != Thread.NORM_PRIORITY)
23                 t.setPriority(Thread.NORM_PRIORITY);
24             return t;
25         }
26     }

 

　　

　

转载于:https://www.cnblogs.com/oreo/p/8026705.html