simpledaemons.java

thinking in java 书中源码 第四版

//: concurrency/SimpleDaemons.java
// Daemon threads don't prevent the program from ending.
import java.util.concurrent.*;
import static net.mindview.util.Print.*;

public class SimpleDaemons implements Runnable {
  public void run() {
    try {
      while(true) {
        TimeUnit.MILLISECONDS.sleep(100);
        print(Thread.currentThread() + " " + this);
      }
    } catch(InterruptedException e) {
      print("sleep() interrupted");
    }
  }
  public static void main(String[] args) throws Exception {
    for(int i = 0; i < 10; i++) {
      Thread daemon = new Thread(new SimpleDaemons());
      daemon.setDaemon(true); // Must call before start()
      daemon.start();
    }
    print("All daemons started");
    TimeUnit.MILLISECONDS.sleep(175);
  }
} /* Output: (Sample)
All daemons started
Thread[Thread-0,5,main] SimpleDaemons@530daa
Thread[Thread-1,5,main] SimpleDaemons@a62fc3
Thread[Thread-2,5,main] SimpleDaemons@89ae9e
Thread[Thread-3,5,main] SimpleDaemons@1270b73
Thread[Thread-4,5,main] SimpleDaemons@60aeb0
Thread[Thread-5,5,main] SimpleDaemons@16caf43
Thread[Thread-6,5,main] SimpleDaemons@66848c
Thread[Thread-7,5,main] SimpleDaemons@8813f2
Thread[Thread-8,5,main] SimpleDaemons@1d58aae
Thread[Thread-9,5,main] SimpleDaemons@83cc67
...
*///:~