How to stop a thread created by implementing runnable interface

Question

I have created class by implementing runnable interface and then created many threads nearly 10  in some other class of my project How to stop some of those threads

User · Answer

Thread currentThread   isInterrupted   is superbly working    but this   code is only pause the timer       This code is stop and reset the thread timer    h1 is handler name    This code is add on inside your button click listener    w h  minutes w m  milli sec i counter    i 0              w h   0              w m   0                textView setText String format   02d   w h          String format   02d   w m                            hl removeCallbacksAndMessages null                           Thread currentThread   isInterrupted

User · Answer

If you use ThreadPoolExecutor  and you use submit   method  it will give you a Future back  You can call cancel   on the returned Future to stop your Runnable task

User · Answer

Stopping the thread in midway using Thread stop   is not a good practice  More appropriate way is to make the thread return programmatically  Let the Runnable object use a shared variable in the run   method  Whenever you want the thread to stop  use that variable as a flag  EDIT  Sample code class MyThread implements Runnable           private Boolean stop   false           public void run                     while  stop                              some business logic                     public Boolean getStop             return stop             public void setStop Boolean stop            this stop   stop                  public class TestStop            public static void main String   args                    MyThread myThread   new MyThread            Thread th   new Thread myThread           th start                       Some logic goes there to decide whether to            stop the thread or not                      This will compell the thread to stop         myThread setStop true

User · Answer

Stopping  Killing  a thread mid-way is not recommended  The API is actually deprecated   However you can get more details including workarounds here  How do you kill a thread in Java

User · Answer

The simplest way is to interrupt   it  which will cause Thread currentThread   isInterrupted   to return true  and may also throw an InterruptedException under certain circumstances where the Thread is waiting  for example Thread sleep    otherThread join    object wait   etc   Inside the run   method you would need catch that exception and or regularly check the Thread currentThread   isInterrupted   value and do something  for example  break out    Note  Although Thread interrupted   seems the same as isInterrupted    it has a nasty side effect  Calling interrupted   clears the interrupted flag  whereas calling isInterrupted   does not   Other non-interrupting methods involve the use of  stop   volatile  flags that the running Thread monitors

User · Answer

How to stop a thread created by implementing runnable interface    There are many ways that you can stop a thread but all of them take specific code to do so   A typical way to stop a thread is to have a volatile boolean shutdown field that the thread checks every so often        set this to true to stop the thread   volatile boolean shutdown   false          public void run           while   shutdown                 continue processing               You can also interrupt the thread which causes sleep    wait    and some other methods to throw InterruptedException   You also should test for the thread interrupt flag with something like     public void run           while   Thread currentThread   isInterrupted                   continue processing           try                 Thread sleep 1000               catch  InterruptedException e                     good practice               Thread currentThread   interrupt                  return                            Note that that interrupting a thread with interrupt   will not necessarily cause it to throw an exception immediately   Only if you are in a method that is interruptible will the InterruptedException be thrown   If you want to add a shutdown   method to your class which implements Runnable  you should define your own class like   public class MyRunnable implements Runnable       private volatile boolean shutdown      public void run             while   shutdown                                        public void shutdown             shutdown   true

[java] How to stop a thread created by implementing runnable interface?

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