Java Multithreading and Parallel Programming Masterclass - Wait Sets and Notifications (Producer Consumer)

The video tutorial covers synchronization in Java, focusing on the wait and notify methods. It explains how these methods manage thread execution and synchronization, using a producer-consumer example to illustrate their application. The tutorial also discusses different execution scenarios and optimizes notification management. While these methods are powerful, they are less common in modern production environments, with newer APIs often preferred.

What is the primary purpose of the synchronized keyword in Java?

• To allow multiple threads to execute a block of code simultaneously

• To ensure that only one thread executes a block of code at a time

• To prevent any thread from executing a block of code

• To increase the speed of thread execution

What happens when a thread calls the wait method on an object?

• The thread acquires a new lock

• The thread continues execution without any delay

• The thread is terminated immediately

• The thread is added to the wait set and releases the lock

Which method is used to wake up a single thread from the wait set?

• interrupt

• notifyAll

• notify

• resume

What is the main advantage of using notifyAll over notify?

• It wakes up all threads in the wait set

• It is faster than notify

• It terminates all waiting threads

• It locks all threads permanently

In the producer-consumer example, what data structure is used to store strings?

• ArrayList

• Stack

• HashMap

• LinkedList

What is the role of the notify method in the producer-consumer example?

• To terminate a thread

• To wake up a waiting thread

• To remove elements from the queue

• To add elements to the queue

How does the consumer thread know when to wait in the producer-consumer example?

• When the queue is full

• When the queue has more than 5 elements

• When the queue is empty

• When the producer is active

What is a potential issue with calling notify when no threads are in the wait set?

• It causes an exception

• It locks the object permanently

• It restarts all threads

• It has no effect

Why might the producer-consumer example not behave consistently every time it runs?

• Due to random number generation

• Because of thread scheduling by the CPU

• Because the queue size changes randomly

• Due to changes in the Java version

What is a key takeaway about the use of wait and notify in modern Java applications?

• They are the only way to handle concurrency

• They are frequently used in new projects

• They are deprecated in the latest Java version

• They are mostly found in legacy code