小编use*_*526的帖子

我有查询,如果我提到我的servlet应用程序的web.xml,如下所示..

<servlet>
<servlet-name>AuthenticationServlet</servlet-name>
<display-name>AuthenticationServlet</display-name>
<servlet-class>com.trading.AuthenticationServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>

<servlet>
<servlet-name>AuthorizationServlet</servlet-name>
<display-name>AuthorizationServlet</display-name>
<servlet-class>com.trading.AuthorizationServlet</servlet-class>
<load-on-startup>4</load-on-startup>
</servlet>

现在我想要AuthenticationServlet servlet容器应该创建它的两个实例,我将如何做,请指教

我正在研究单身人士,我开发了一个非常基本的单身人士课程.

public class SingletonObject {
    private static SingletonObject ref;
    private SingletonObject () //private constructor
    { }

    public  static synchronized   SingletonObject getSingletonObject()
    {
        if (ref == null)
            ref = new SingletonObject();
                return ref;
        }


    public Object clone() throws CloneNotSupportedException
    {throw new CloneNotSupportedException ();
    }   
}

现在下面是我破解单身人士的一种方式..

public class CrackingSingleton {

     public static void main(String[] args) throws ClassNotFoundException,
       IllegalArgumentException, SecurityException,
       InstantiationException, IllegalAccessException,
       InvocationTargetException {

        //First statement retrieves the Constructor object for private constructor of SimpleSingleton class.
        Constructor pvtConstructor = Class.forName("CrackingSingleton.SingletonObject").getDeclaredConstructors()[0];
        //Since the …

我有一个要求,我想创建一个5线程的池,现在我想从这5个线程中的1个线程作为一个daemon线程,当这个特定的1个线程变为守护线程时,那么我想分配一些任务到那个与任何服务相关的守护程序线程,当java程序退出时我可以在窗口任务管理器中检查特定的守护程序线程是否还在执行该任务.请告知如何实现该目的..!因为我被困在这......

下面是我的代码......

public class StoppingThread extends Thread //extend thread class 
{
    // public  synchronized void run()
     //synchronized (this)

    private volatile boolean Completed = false;


    public void setCompleted() {
        Completed = true;
    }


    public void run()
    {
      for(int i=0;i<20 && !Completed;++i) {
          System.out.println(Thread.currentThread().getName());
        try {
          Thread.sleep(500);

          System.out.print(i +"\n"+ "..");
        } catch(Exception e) {
          e.printStackTrace();
        }
      } 
    } 

 public static void main(String... a) 
 {
     StoppingThread x = new StoppingThread();
     StoppingThread y = new StoppingThread();
     x.start();
     x.setName("first");
     x.setCompleted(); // Will complete …