We will use the CountDownLatch to coordinate those two threads, to prevent a situation when the consumer accesses a value of a shared variable that was not set yet. Next, the consumer thread will fetch a value from a shared variable. Let’s say that we have two threads – a producer and a consumer – and when the producer is setting a value of a shared variable, we want to signal that fact to the consumer thread. To see why the SynchronousQueue can be so useful, we will implement a logic using a shared variable between two threads and next, we will rewrite that logic using SynchronousQueue making our code a lot simpler and more readable.
