Java Multithreading and Parallel Programming Masterclass - The Synchronized keyword

The video tutorial introduces the synchronized keyword in Java, explaining its role in preventing race conditions by ensuring that only one thread can execute a critical section at a time. It describes how race conditions occur when multiple threads access a shared variable, leading to inconsistent program behavior. The tutorial demonstrates the use of synchronized blocks and methods to manage thread access, ensuring consistency and thread safety. It also explains the concept of monitors and the importance of using a common object for synchronization.

What is the main issue with the initial code setup discussed in the video?

• It results in a race condition.

• It is too slow.

• It does not compile.

• It uses too much memory.

How does a race condition affect the program's output?

• It makes the output always zero.

• It doubles the expected output.

• It has no effect on the output.

• It causes the output to be unpredictable.

What is the purpose of a synchronized block in Java?

• To ensure only one thread executes a critical section at a time.

• To increase memory usage.

• To allow multiple threads to execute simultaneously.

• To speed up thread execution.

What is a critical section in the context of a synchronized block?

• A section of code that can be executed by multiple threads simultaneously.

• A section of code that must be executed by a single thread at a time.

• A section of code that is skipped by all threads.

• A section of code that is executed only once.

What is the role of the monitor in a synchronized block?

• It increases the memory usage of the program.

• It allows multiple threads to enter the critical section simultaneously.

• It acts as a key to control access to the critical section.

• It speeds up the execution of threads.

How does the synchronized keyword in a method signature differ from a synchronized block?

• It applies to the current instance or class object.

• It does not require a monitor.

• It applies to the entire class.

• It allows multiple threads to execute the method simultaneously.

What happens when the synchronized keyword is used in a static method?

• It applies to the instance of the class.

• It applies to the class object.

• It has no effect.

• It allows multiple threads to execute the method simultaneously.