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How to stop a Runnable thread or "interface"

I need to stop this code anyway, is there any way to do this. I don't fit in with the topics if someone can answer the question and post a link to where you can learn threads, but not at the beginner level. Ive read a lot of books on java. The basics seem casual, except for files, BufferedWriters and stuff. So anything that could fine tune the basics or where to go from there. sorry i have a question in the question. :)

private final Runnable updateCircle = new Runnable() {
        @Override 
        public void run() {
            lastColor = random.nextInt(2) == 1 ? redColor : greenColor;
            paint.setColor(lastColor);
            invalidate();
            handler.postDelayed(this, 1000);
        }
    };
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There is only one way to properly stop the thread: from this thread code, leaving the run () method. The most popular ways to achieve this are:

  • Flying flag - useful when your thread is running on cpu

    volatile boolean stop = false
void run() {
    doComputation();
    if (stop) return;
    doAnotherComputation();
    if (stop) return;
    doMoreComputation();
}

  • interruption - when your thread mostly sleeps on padlocks

    void run() {
  synchronized(lock) {
    lock.wait(); //wait() will throw InterruptedException here
  }
}
//from another thread
myThread.interrupt();`


As a consequence, if you call library code that takes a long time and does not respond to interrupt (), that code cannot be interrupted correctly to stop the thread in which it is running.

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Themes in Java currently poll the flag to see if the thread has been interrupted . When called interrupt()

on a thread, the function Thread.interrupted()

will return true

. Therefore, you can work as long as it Thread.interrupted()

returns false

:



while (!Thread.interrupted()){
    ...
}
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