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 。

 

public class ThreadFactoryExample {
    public static void main(String[] args) {
        ThreadFactory factory = Executors.defaultThreadFactory();
        factory.newThread(new Task()).start();
        for (int i = 0; i < 10; i++) {
            System.out.println("Hello");
        }
    }
}

class Task implements Runnable {

    @Override
    public void run() {
        for (int i = 0; i < 10; i++) {
            System.out.println("Task");
        }
    }
}

 

　　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

static class DefaultThreadFactory implements ThreadFactory {
        private static final AtomicInteger poolNumber = new AtomicInteger(1);
        private final ThreadGroup group;
        private final AtomicInteger threadNumber = new AtomicInteger(1);
        private 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;
        }
    }