Implement a blocking function call in Java

Question

What is the recommended / best way to implement a blocking function call in Java, that can be later unblocked by a call from another thread?

Basically I want to have

Answer 1

You can use a CountDownLatch.

latch = new CountDownLatch(1);

To block, call:

latch.await();

To unblock, call:

latch.countDown();