Java Multithreading Questions et reponses d'entretien
Question 16. What is the ReentrantLock class in Java?
The ReentrantLock class is a part of the java.util.concurrent package and provides a flexible locking mechanism with the ability to interrupt a thread that is waiting for the lock.
Example:
ReentrantLock lock = new ReentrantLock();
lock.lock();
try { /* Critical section */ }
finally { lock.unlock(); }
Question 17. Explain the concept of thread local variables.
Thread-local variables are variables that are local to each thread, and each thread has its own copy of the variable.
Example:
ThreadLocalthreadLocalVariable = new ThreadLocal<>();
threadLocalVariable.set("Value");
Question 18. What is the Executor framework in Java?
The Executor framework provides a higher-level replacement for managing threads. It decouples the task creation and execution, allowing better control over thread management.
Example:
Executor executor = Executors.newFixedThreadPool(3);
executor.execute(() -> { /* Task logic */ });
Question 19. Explain the concept of the producer-consumer problem in multithreading.
The producer-consumer problem involves two types of threads: producers that produce data and consumers that consume the data. The challenge is to synchronize their activities.
Example:
Using a shared buffer and synchronization mechanisms to ensure proper communication between producers and consumers.
Question 20. What is the purpose of the notify() method in Java?
The notify() method is used to wake up a single thread that is waiting on an object's monitor. It is part of the wait-notify mechanism for inter-thread communication.
Example:
synchronized (sharedObject) {
sharedObject.notify();
}
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