daemons.java

中文JAVA编程思想第二版,一本很好的JAVA入门书籍!

//: c14:Daemons.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Daemonic behavior.
import java.io.*;

class Daemon extends Thread {
  private static final int SIZE = 10;
  private Thread[] t = new Thread[SIZE];
  public Daemon() { 
    setDaemon(true);
    start();
  }
  public void run() {
    for(int i = 0; i < SIZE; i++)
      t[i] = new DaemonSpawn(i);
    for(int i = 0; i < SIZE; i++)
      System.out.println(
        "t[" + i + "].isDaemon() = " 
        + t[i].isDaemon());
    while(true) 
      yield();
  }
}

class DaemonSpawn extends Thread {
  public DaemonSpawn(int i) {
    System.out.println(
      "DaemonSpawn " + i + " started");
    start();
  }
  public void run() {
    while(true) 
      yield();
  }
}

public class Daemons {
  public static void main(String[] args) 
  throws IOException {
    Thread d = new Daemon();
    System.out.println(
      "d.isDaemon() = " + d.isDaemon());
    // Allow the daemon threads to
    // finish their startup processes:
    System.out.println("Press any key");
    System.in.read();
  }
} ///:~