Java Concurrency Interview Questions and Answers
Intermediate / 1 to 5 years experienced level questions & answers
Ques 1. What is the Executor framework in Java?
The Executor framework provides a higher-level replacement for managing threads and thread pools.
Ques 2. How does the wait-notify mechanism work in Java?
wait() and notify() are methods used for inter-thread communication. wait() makes a thread wait until another thread invokes notify() or notifyAll().
Ques 3. Explain the concept of the volatile keyword in Java.
The volatile keyword ensures that a variable's value is always read and written from and to the main memory, preventing thread-local caching.
Ques 4. What is the purpose of the java.util.concurrent package?
The java.util.concurrent package provides a framework for concurrent programming, including high-level abstractions such as Executors, Concurrent Collections, and synchronization utilities.
Ques 5. Explain the concept of the ReentrantLock class.
ReentrantLock is an implementation of the Lock interface that allows a thread to acquire the lock multiple times without deadlocking.
Ques 6. What is the purpose of the AtomicInteger class?
AtomicInteger provides atomic operations for integer variables, ensuring that operations are performed in an atomic and thread-safe manner.
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