Concurrency – Page 22 – Sharp: NCLEX, Java & Python

Java: Synchronized and Locks

What happens if a thread holds a lock and tries to acquire it again?

What are the benefits of ReentrantLock over synchronized?

How does synchronized affect an object's monitor?

What can cause performance issues with 'synchronized'?

How would you explain a tradeoff when using Collections.synchronizedMap in an interview?

What error can occur with a HashMap under concurrent modification?

Why is ConcurrentHashMap preferable in high-concurrency scenarios?

Can ConcurrentHashMap handle null keys or values?

How does lock striping reduce contention in ConcurrentHashMap?

What happens if a key is modified during iteration in ConcurrentHashMap?