Can a dead thread be alive again !!

can a dead thread be alive again ?
i have added some threads in a thread group. and then called its activeCount() methods.
it is giving results like this....
the active count:10
the active count:5
the active count:2
the active count: 1
the active count: 2 // dead thread alive ?
the active count: 0
is it feasible theoretically ? i am getting that kind of output

as most of the time, the API doc saves the day :
activeCount
public int activeCount()
Returns an estimate of the number of active
tive threads in this thread group. The result might
not reflect concurrent activity,
number of activetive threadswhat is the meaning of active here ? alive() ? there is a isalive() method already ......
and might be
affected by the presence of certain system threads......u mean system thread can leak into my threadgroup....well
Due to the inherently imprecise nature of the
the result, it is recommended that this method only
be used for informational purposes.
Returns:
an estimate of the number of active threads
threads in this thread group and in any other thread
group that has this thread group as an ancestor.
Since:
JDK1.0

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Thanks

ItsJava wrote:
Hi all,
I've create a thread to make a http request in every 10 second and get a string as the response from the server. Requesting process start on the window open. And also I can dispose the window, so my processing is not stop. That is exactly what I want to do.
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else
return false;
}If I found the thread true on the above code, I want to stop it. So I try this.
public void stop(){
processThread = null;
That does not "stop" the thread, it simply removes that reference to it.
>
I think up to now what I have done is ok. Then on the ActionListner I do this.
ActionListener actionListener = new ActionListener(){
public void actionPerformed(ActionEvent e){
if(appProcess.IsThreadAlive()){
appProcess.stop();
System.out.println("Main Dialog!");
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
MainDialog dialog = new MainDialog(new javax.swing.JFrame(), true);
dialog.setVisible(true);
};No compile error. But I got a runtime exception.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at mytrayicon.Processing.IsThreadAlive(Processing.java:82)
at mytrayicon.PanelRadarMain$3.actionPerformed(PanelRadarMain.java:73)
at java.awt.TrayIcon.processActionEvent(TrayIcon.java:750)
at java.awt.TrayIcon.processEvent(TrayIcon.java:708)
at java.awt.TrayIcon.dispatchEvent(TrayIcon.java:690)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
I'm sorry, but you set a reference to null, then attempt to derference it, and you wonder why you get an NPE?
>
Can anybody help me to solve this.
ThanksTo stop the thread, have a volatile variable that you can change the value of using a synchronized method, and have the thread
periodically check the value of this variable and stop itself when the value equals a specific value. That is one way to properly
stop the thread.

The Concept of Dead Thread

1)What do u mean by a dead thread????
2)Is it possible to restart a dead???
I think we can never kill a thread....... i think the underlying OS plays a vital role in this aspect
Please correct me if im wrong

Hi This is Kranthi .Ca u be clear reg this concept of
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To check wether any thread is Alive

I have code in some method
while(!checkThreadState(one))
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Because making a thread in wait state leads to performance degradation.Compared to what?
I would just iterate the array and join() each thread in turn myself.

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Gesendet mit meinem Asus Ultrabook
2015-05-01 0:27 GMT+02:00 Jeff A Wright <[email protected]>:
Hey Nerds, How can i get my serial number again?
Jeff A Wright
<https://forums.adobe.com/people/JeffAWright?et=watches.email.outcome>
marked Ned Murphy
<https://forums.adobe.com/people/Ned+Murphy?et=watches.email.outcome>'s
reply on Hey Nerds, How can i get my serial number again?
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You're welcome.
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http://support.apple.com/kb/HT4946
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CalDAV and subscribed calendar accounts.
Calendar accounts.
Calendar events.
Call history.
Camera Roll (Photos, screenshots, images saved, and videos taken. Videos greater than 2 GB are backed up with iOS 4.0 and later.)
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Paired Bluetooth devices (which can only be used if restored to the same phone that did the backup).
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Messages (iMessage and carrier SMS or MMS pictures and videos).
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Voice memos.
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Wallpapers.
Web clips.
YouTube bookmarks and history.
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http://support.apple.com/kb/HT4859
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You get unlimited free storage for:
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App data
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Marco

>
If the thread is accessible from your program -- ie,
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[Dead thread]

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Last edited by LeoAtFarm (2009-10-29 15:06:36)

Might I be as bold as to recomend a different set of tutorials.
http://java.sun.com/docs/books/tutorial/index.html
http://java.sun.com/docs/books/tutorial/essential/threads/index.html
For a start "stop" is pointless. The threads stop as soon as they exit "run".
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Nothing happened to it.
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Can a dead thread be alive again !!

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