Interview Questions and Answers

The Executor framework provides a higher-level replacement for managing threads and thread pools.

wait() and notify() are methods used for inter-thread communication. wait() makes a thread wait until another thread invokes notify() or notifyAll().

The volatile keyword ensures that a variable's value is always read and written from and to the main memory, preventing thread-local caching.

The java.util.concurrent package provides a framework for concurrent programming, including high-level abstractions such as Executors, Concurrent Collections, and synchronization utilities.

ReentrantLock is an implementation of the Lock interface that allows a thread to acquire the lock multiple times without deadlocking.

AtomicInteger provides atomic operations for integer variables, ensuring that operations are performed in an atomic and thread-safe manner.