Create a Custom Lock in Java
This deep dive explains the problem model, concurrency contract, Java implementation, and real-world caveats you should know before using this pattern in pro...
Concurrency
Double-Checked Locking Singleton Pattern in Java
Double-checked locking provides lazy initialization with lower synchronization overhead after initialization.
CyclicBarrier in Java
CyclicBarrier lets a fixed number of threads wait until all participants reach the same synchronization point.
Semaphore in Java
A Semaphore controls how many threads can access a shared resource at the same time.
Create a Custom Thread Pool in Java
This is a learning-oriented implementation to understand worker threads, queueing, and task execution flow.
Create a Custom CountDownLatch in Java
This post explains how a latch works internally using a simplified custom implementation.
BlockingQueue in Java
BlockingQueue is a thread-safe queue from java.util.concurrent used heavily in producer-consumer systems.
Execute N Threads One After Another in Cyclic Order
Interview-style concurrency problem: ensure threads print in strict round-robin sequence.
ExecutorService invokeAll Example in Java
invokeAll submits a collection of Callable tasks and waits until all complete.
DelayQueue in Java with Example
DelayQueue is a specialized blocking queue where elements become available only after a delay expires.