May 4, 2016 · Wait for the thread to finish (die) before proceeding; ie. one.start(); one.join(); If you don't start() it, nothing will happen - creating a Thread doesn't execute it. If you don't join) it, your main thread may finish and exit and the whole program exit before the other thread has been scheduled to execute. It's indeterminate whether it runs ...

5 days ago · Thread creation by extending the Thread class. We create a class that extends the java.lang.Thread class. This class overrides the run() method available in the Thread class. A thread begins its life inside run() method. We create an object of our new class and call start() method to start the execution of a thread.

Aug 8, 2014 · I want to spawn a Java thread from my main java program and that thread should execute separately without interfering with the main program. Here is how it should be: Main program initiated by the user; Does some business work and should create a new thread that could handle the background process

Aug 15, 2010 · If your method is going to be called frequently, then it may not be worth creating a new thread each time, as this is an expensive operation. It would probably be best to use a thread pool of some sort. Have a look at Future, Callable, Executor classes in …

May 15, 2017 · Your situation is one of the most common causes for deadlocks- make sure you signal the other thread regardless of errors that may have occurred. Example- if your application throws an exception- and never calls the method to signal the other that things have completed. This will make it so the other thread never 'wakes up'.

Jun 5, 2019 · You could use a CountDownLatch from the java.util.concurrent package. It is very useful when waiting for one or more threads to complete before continuing execution in the awaiting thread. For example, waiting for three tasks to complete: CountDownLatch latch = new CountDownLatch(3); ... latch.await(); // Wait for countdown

Jun 9, 2012 · Using Thread.interrupt() is a perfectly acceptable way of doing this. In fact, it's probably preferrable to a flag as suggested above. The reason being that if you're in an interruptable blocking call (like Thread.sleep or using java.nio Channel operations), you'll actually be able to break out of those right away.

Dec 9, 2021 · When your thread is hit by an interrupt it will go into the InterruptedException catch block. You can then check how much time the thread has spent sleeping and work out how much more time there is to sleep.

If I read the link above correctly, thread.sleep() raises the interrupt flag. The try turns off the interrupt flag. Calling Thread.currentThread().interrupt(); raises the interrupt flag again. If other parts of your program (e.g dependencies) rely on threading/ or sleep as well, it will be looking for this nonexistent interrupt flag.

Mar 13, 2019 · Thus, if one thread updates the value of any of the state variables, the other thread may not see it and it may read a stale value. A very easy way do avoid this would be to make the state variables volatile. It's a weak synchronization primitive though, and does not provide atomic behavior like synchronized does.