Daemon线程[Java编程]

//: Daemons.java
// 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) {
    Thread d = new Daemon();
    System.out.println(
      "d.isDaemon() = " + d.isDaemon());
    // Allow the daemon threads to finish
    // their startup processes:
    BufferedReader stdin =
      new BufferedReader(
        new InputStreamReader(System.in));
    System.out.println("Waiting for CR");
    try {
      stdin.readLine();
    } catch(IOException e) {}
  }
} ///:~