Simply describe
public static void main(String[] args ){
Thread t = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread stopped");
}
});
try {
t.start();
t.join();
System.out.println("task completed");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
t.join() The main thread waits for its subthread t to die. the call stack of t.join() just like
join -> join(0)
public final synchronized void join(long millis)
throws InterruptedException {
long base = System.currentTimeMillis();
long now = 0;
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (millis == 0) {
while (isAlive()) {
wait(0);
}
} else {
while (isAlive()) {
long delay = millis - now;
if (delay <= 0) {
break;
}
wait(delay);
now = System.currentTimeMillis() - base;
}
}
}
The main locked the object t and waited for notification. I have some confusion when and where the notify be called. Does the native function stop0() call it?
