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  1. class Ideone {
  2.   private static final Object lock = new Object();
  3.  
  4.   public static void main(String[] args) {
  5.     printWithThreadNamePrefix("Start");
  6.     Thread waiter = new Thread(Ideone::waiter);
  7.     waiter.start();
  8.  
  9.     // Give waiter some time to a) start and b) acquire the intrinsic lock
  10.     try {
  11.       Thread.sleep(500);
  12.     } catch (InterruptedException e) {
  13.     }
  14.  
  15.     final Thread notifier = new Thread(Ideone::notifier);
  16.     notifier.start();
  17.  
  18.     while (true) {
  19.       try {
  20.         waiter.join();
  21.         break;
  22.       } catch (InterruptedException e) {
  23.       }
  24.     }
  25.  
  26.     printWithThreadNamePrefix("End");
  27.   }
  28.  
  29.   private static void waiter() {
  30.     synchronized (lock) {
  31.       printWithThreadNamePrefix("Waiting...");
  32.       while (true) {
  33.         try {
  34.           lock.wait();
  35.           break;
  36.         } catch (InterruptedException e) {
  37.         }
  38.       }
  39.       printWithThreadNamePrefix("... done waiting");
  40.     }
  41.   }
  42.  
  43.   private static void printWithThreadNamePrefix(String msg) {
  44.     System.out.println(String.format(
  45.         "%s: %s",
  46.         Thread.currentThread().getName(),
  47.         msg));
  48.   }
  49.  
  50.   private static void notifier() {
  51.     synchronized (lock) {
  52.       printWithThreadNamePrefix("notifying");
  53.       lock.notify();
  54.       while (true) {
  55.       }
  56.     }
  57.   }
  58. }
Time limit exceeded #stdin #stdout 5s 54072KB
comments (?)
stdin 
Standard input is empty
stdout 
main: Start
Thread-0: Waiting...
Thread-1: notifying
https://ideone.com/sAsGMU
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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