class Sync {
	public static void main(String[] args) throws InterruptedException {
		Sync s = new Sync();
		Thread t1 = new Thread(() -> s.f());
		Thread t2 = new Thread(() -> s.g());

		t1.start();
		Thread.sleep(1 * 1000);
		t2.start();

		t1.join();
		t2.join();
	}

	synchronized void f() {
		System.out.println("I'm in f");
		try {
			Thread.sleep(10 * 1000); // 10 secs
		} catch (InterruptedException e) {
		}
	}

	synchronized void g() {
		System.out.println("I'm in g");
	}
}