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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: javax.swing.Timer blocking program termination
Date: Mon, 13 Jul 2015 22:13:21 -0400
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On 07/13/2015 09:35 PM, Jeff Higgins wrote:
> On 07/13/2015 08:46 PM, Knute Johnson wrote:
>> On 7/13/2015 17:27, Jeff Higgins wrote:
>>> On 07/13/2015 07:03 PM, Knute Johnson wrote:
>>>> So I have this program that uses a couple of javax.swing.Timers.  I
>>>> forgot to put in code to stop one of the timers yet the program would
>>>> still terminate.  I have set the default close operation for the frame
>>>> to be DISPOSE_ON_CLOSE.
>>>>
>>>> What I found was that a timer of less the 1000ms would prevent an
>>>> application based on a JFrame from stopping but 1000ms or more and it
>>>> would stop just fine.
>>>>
>>>> I know that javax.swing.Timer uses a common thread for all timers but I
>>>> don't see anywhere that describes the stopping behavior.
>>>>
>>>> The program below will stop if the JFrame is closed and the timer is
>>>> 1000ms or greater but hang if it is less.  I would be really curious to
>>>> know if somebody else can duplicate this.
>>>>
>>>> import java.awt.*;
>>>> import java.awt.event.*;
>>>> import javax.swing.*;
>>>>
>>>> public class test extends JFrame {
>>>>      public test() {
>>>>          Timer timer = new Timer(1000,event -> {});
>>>>          setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
>>>>          setSize(400,300);
>>>>          setVisible(true);
>>>>          timer.start();
>>>>      }
>>>>
>>>>      public static void main(String... args) {
>>>>          EventQueue.invokeLater(() -> new test());
>>>>      }
>>>> }
>>>>
>>>
>>>
>>> import java.awt.EventQueue;
>>> import javax.swing.JFrame;
>>> import javax.swing.Timer;
>>>
>>> public class test extends JFrame {
>>>    public test() {
>>>      Timer timer = new Timer(900, event -> {
>>>        System.out.println("-"); });
>>>      addWindowListener(new java.awt.event.WindowAdapter() {
>>>        @Override
>>>        public void windowClosing(java.awt.event.WindowEvent
>>> windowEvent) {
>>>          System.out.println("Close"); }});
>>>      setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
>>>      setSize(400, 300);
>>>      setVisible(true);
>>>      timer.start();
>>>    }
>>>
>>>    public static void main(String... args) {
>>>      EventQueue.invokeLater(() -> new test());
>>>    }
>>> }
>>>
>>>
>>> jeff@debian:~$ javac test.java
>>> jeff@debian:~$ java -showversion test
>>> java version "1.8.0_40"
>>> Java(TM) SE Runtime Environment (build 1.8.0_40-b25)
>>> Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
>>>
>>> -
>>> -
>>> Close
>>> -
>>> -
>>> -
>>> -
>>> ^Z
>>> [1]+  Stopped                 java -showversion test
>>> jeff@debian:~$ jobs
>>> [1]+  Stopped                 java -showversion test
>>> jeff@debian:~$ fg
>>> java -showversion test
>>> -
>>> -
>>> -
>>> -
>>> ^Cjeff@debian:~$
>>>
>>>
>>
>> and does it stop on your Linux (I assume) system if the delay is 1000ms
>> or more?
>>
> Very consistantly
> With 1000 it continues as long as I can stand.
> With 1001 I get
> -
> Close
> -
> -
> -
> -
> jeff@debian:~$
>
> With 1002 I get
> -
> Close
> -
> -
> -
> jeff@debian:~$
>
> With 1003 I get
> -
> Close
> -
> jeff@debian:~$
>
> With 1500 I get
> -
> Close
> -
> jeff@debian:~$
>
>
If I put a timer.stop()

addWindowListener(new java.awt.event.WindowAdapter() {
   @Override
   public void windowClosing(java.awt.event.WindowEvent windowEvent)
   { System.out.println("Close"); timer.stop();}});

for values of 1000 or less continues to print -
for values greater than 1000 doesn't print any - after Close