how to set boolean flag of thread-1 from thread-2 in Java multithreading

Question

I am writing a simple multithreaded application that involves three threads: Thread-1, Thread-2 and main.

Answer 1

You could use AtomicBoolean and pass it to the both threads, Atomic types is accessable throw multithreading also thread safe.

first declare you flag isDone as AtomicBoolean

private AtomicBoolean isDone;

then declare one AtomicBoolean object and pass it to the both threads

PipedOutputStream pos= new PipedOutputStream();
PipedInputStream pis = new PipedInputStream(pos);
AtomicBoolean isDone = new AtomicBoolean();
NumGen ng = new NumGen(pos, isDone);
RunningAvg ra = new RunningAvg(pis, isDone);
ng.start();
ra.start();

finally once you want to stop generting numbers ask Thread-2 to set the isDone false.