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This article explains how to create three Java threads that print the characters A, B, and C in strict order, repeat the sequence twenty times, and demonstrates three implementations—unordered printing, ordered printing with Semaphore, and a looped version—complete with full source code examples.
This article uses everyday analogies to explain thread coordination, then demonstrates practical Java examples for stopping threads with flags, pausing/resuming, joining, barrier synchronization, exchanging tools, and phaser control, and finally ties them together with the classic producer‑consumer problem using locks and conditions.
This article explains the internal workings of Java's Semaphore, detailing its AQS-based architecture, fair and non‑fair synchronization strategies, core methods such as acquire, release, and their implementations, and provides a practical example demonstrating semaphore usage for thread coordination.