Java Concurrency - ThreadFactory, 使用工厂方法创建线程

当需要创建多个类似的线程实例时，使用工厂模式替代 new 操作符创建线程，能使代码更为简洁，易于维护。JDK 提供了 java.util.concurrent.ThreadFactory 接口，ThreadFactory 只有一个方法 newThread，它接收一个 Runnable 参数，返回一个 Thread 实例。

public class DaemonThreadFactory implements ThreadFactory {

    @Override
    public Thread newThread(Runnable task) {
        Thread thread = new Thread(task);
        thread.setDaemon(true);
        return thread;
    }

}

public class Task implements Runnable {

    @Override
    public void run() {
        try {
            Thread.sleep(1000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}

public class Main {

    public static void main(String[] args) {

        DaemonThreadFactory daemonThreadFactory = new DaemonThreadFactory();
        for (int i = 0; i < 3; i++) {
            Thread thread = daemonThreadFactory.newThread(new Task());
            thread.start();
        }

    }

}