daemonexam.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

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 DaemonExam {
  public static void main(String[] args) {
    Thread d = new Daemon();
    System.out.println("d.isDaemon() = " + d.isDaemon());
  }
}