Adeptia Backend Developer Interview Questions and Answers for Experienced

Multithreading is the ability of a CPU to execute multiple threads concurrently, allowing for parallel processing.

• Multithreading allows for better utilization of CPU resources by running multiple threads simultaneously.

• Threads share the same memory space, allowing for efficient communication and data sharing.

• Examples of multithreading include running multiple tasks in a web server concurrently or processing data in par

Reentrant lock is a synchronization primitive that allows a thread to acquire the same lock multiple times.

• Allows a thread to acquire the same lock multiple times

• Prevents deadlock by allowing a thread to re-enter the lock it already holds

• Useful in situations where a method needs to call another method that also requires the same lock

• Example: Java's ReentrantLock class

ConcurrentHashMap allows multiple threads to read/write concurrently, while HashMap is not thread-safe.

• ConcurrentHashMap allows multiple threads to read/write concurrently without blocking each other.

• HashMap is not thread-safe and can lead to data corruption if accessed by multiple threads simultaneously.

• ConcurrentHashMap achieves thread-safety by using internal synchronization mechanisms like locks or CAS operations.

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