java - How to tell main thread that part of thread job is done -
is true notify works after thread finished? in code below can't notification until comment while (true). how tell main thread part of thread job done?
public class threadmain { public thread reader; private class serialreader implements runnable { public void run() { while (true) { try { thread.sleep(3000); synchronized(this) { system.out.println("notifying"); notify(); system.out.println("notifying done"); } } catch (exception e) { system.out.println(e); } } } } threadmain() { reader = new thread(new serialreader()); } public static void main(string [] args) { threadmain d= new threadmain(); d.reader.start(); synchronized(d.reader) { try { d.reader.wait(); system.out.println("got notify"); } catch (exception e) { system.out.println(e); } } } }
you should try avoid using wait , notify newer versions of java, they're difficult right. try using blockingqueue instead
public class threadmain { public final blockingqueue<boolean> queue = new linkedblockingqueue<>(); private class serialreader implements runnable { public void run() { while (true) { try { thread.sleep(3000); system.out.println("notifying"); queue.offer(boolean.true); system.out.println("notifying done"); } catch (exception e) { system.out.println(e); } } } } threadmain() { reader = new thread(new serialreader()); } public static void main(string [] args) { threadmain d= new threadmain(); d.reader.start(); try { d.queue.take(); // block until put in queue system.out.println("got notify"); } catch (exception e) { system.out.println(e); } } }
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