class Task implements Runnable {
static int sum = 0;
public void run() {
synchronized(this) {
++sum;
}
}
}
public class Main {
public static void main(String args[]) throws Exception {
Task task = new Task();
for (int i = 0; i < 10000; i++) {
new Thread(task).start();
}
Thread.sleep(1000); // ad-hoc wait till threads finish
System.out.println("sum: " + Task.sum);
}
}
