Java Programming for Complete Beginners - Java 16 - Step 03 - Enter Locks with ReEntrantLock

The video tutorial explains the use of locks in Java programming to manage thread safety, offering an alternative to the synchronized keyword. It covers the implementation of locks, specifically reentrant locks, and discusses their advantages in breaking synchronized code into smaller, manageable parts. The tutorial also explores advanced lock methods like tryLock and their practical applications, providing a comprehensive understanding of how locks can enhance code flexibility and efficiency.

What problem do locks help to solve when compared to the synchronized keyword?

• They eliminate the need for thread synchronization.

• They enable breaking synchronized code into smaller parts.

• They prevent any thread from accessing synchronized methods.

• They allow multiple threads to execute the same synchronized method.

How do locks improve the execution of code by multiple threads?

• By enabling threads to execute different parts of code concurrently.

• By ensuring only one thread can execute at any time.

• By preventing any thread from executing until all locks are released.

• By allowing all threads to execute simultaneously.

What is the purpose of creating separate lock instances for different methods?

• To ensure that no two methods can be executed at the same time.

• To allow different threads to execute different methods concurrently.

• To prevent any method from being executed by multiple threads.

• To synchronize all methods under a single lock.

What happens when a thread tries to acquire a lock that is already held by another thread?

• The thread will execute the code without acquiring the lock.

• The thread will terminate immediately.

• The thread will wait until the lock is released.

• The thread will acquire a different lock.

What is a reentrant lock?

• A lock that cannot be released once acquired.

• A lock that allows a thread to re-acquire it without blocking.

• A lock that can be acquired by multiple threads simultaneously.

• A lock that is automatically released after a set time.

What does the tryLock method do?

• It tries to acquire the lock and returns immediately if unsuccessful.

• It waits indefinitely until the lock is available.

• It forces the lock to be acquired by the current thread.

• It releases the lock if it is held by another thread.

How can you limit the time a thread waits to acquire a lock?

• By using a reentrant lock.

• By using a synchronized block.

• By setting a timeout on the lock acquisition.

• By releasing all other locks first.