package fr.umlv.conc;

public class Counter {
  private volatile boolean stop;
  private volatile long counter;
  
  public void runCounter() {
    int localCounter = 0;
    while(!stop) {
      counter++;
      localCounter++;
    }
    System.out.println(localCounter);
  }
  
  public void stop() {
    stop = true;
  }
  
  public static void main(String[] args) throws InterruptedException {
    Counter counter = new Counter();
    Runnable runnable = counter::runCounter;
    Thread thread1 = new Thread(runnable);
    Thread thread2 = new Thread(runnable);
    thread1.start();
    thread2.start();
    Thread.sleep(100);
    counter.stop();
    thread1.join();
    thread2.join();
    System.out.println("sum: " + counter.counter);
  }
}